diff --git a/all.sas b/all.sas
index b51cf41..9b8c9e3 100644
--- a/all.sas
+++ b/all.sas
@@ -7954,8 +7954,8 @@ run;
 %mend mp_guesspk;/**
   @file
   @brief Returns a unique hash for a dataset
-  @details Ignores metadata attributes, used only to hash values. Compared
-  datasets must be in the same order.
+  @details Ignores metadata attributes, used only to hash values. If used to
+  compare datasets, they must have their columns and rows in the same order.
 
       %mp_hashdataset(sashelp.class,outds=myhash)
 
@@ -7970,7 +7970,10 @@ run;
   @li mf_getattrn.sas
   @li mf_getuniquename.sas
   @li mf_getvarlist.sas
-  @li mf_getvartype.sas
+  @li mp_md5.sas
+
+  <h4> Related Files </h4>
+  @li mp_hashdataset.test.sas
 
   @param [in] libds dataset to hash
   @param [in] salt= Provide a salt (could be, for instance, the dataset name)
@@ -7988,51 +7991,52 @@ run;
 
 %macro mp_hashdataset(
   libds,
-  outds=,
+  outds=work._data_,
   salt=,
   iftrue=%str(1=1)
 )/*/STORE SOURCE*/;
 
-  %if not(%eval(%unquote(&iftrue))) %then %return;
+%local keyvar /* roll up the md5 */
+  prevkeyvar /* retain prev record md5 */
+  lastvar /* last var in input ds */
+  cvars nvars;
 
-  %if %mf_getattrn(&libds,NLOBS)=0 %then %do;
-    %put %str(WARN)ING: Dataset &libds is empty, or is not a dataset;
-  %end;
-  %else %if %mf_getattrn(&libds,NLOBS)<0 %then %do;
-    %put %str(ERR)OR: Dataset &libds is not a dataset;
-  %end;
-  %else %do;
-    %local keyvar /* roll up the md5 */
-      prevkeyvar /* retain prev record md5 */
-      lastvar /* last var in input ds */
-      varlist var i;
-    /* avoid naming conflict for hash key vars */
-    %let keyvar=%mf_getuniquename();
-    %let prevkeyvar=%mf_getuniquename();
-    %let lastvar=%mf_getuniquename();
-    %let varlist=%mf_getvarlist(&libds);
-    data &outds(rename=(&keyvar=hashkey) keep=&keyvar);
-      length &prevkeyvar &keyvar $32;
-      retain &prevkeyvar "%sysfunc(md5(%str(&salt)),$hex32.)";
-      set &libds end=&lastvar;
-      /* hash should include previous row */
-      &keyvar=put(md5(&prevkeyvar
-      /* loop every column, hashing every individual value */
-    %do i=1 %to %sysfunc(countw(&varlist));
-      %let var=%scan(&varlist,&i,%str( ));
-      %if %mf_getvartype(&libds,&var)=C %then %do;
-          !!put(md5(trim(&var)),$hex32.)
-      %end;
-      %else %do;
-          !!put(md5(trim(put(&var*1,binary64.))),$hex32.)
-      %end;
-    %end;
-      ),$hex32.);
-      &prevkeyvar=&keyvar;
-      if &lastvar then output;
-    run;
-  %end;
-%mend mp_hashdataset;/**
+%if not(%eval(%unquote(&iftrue))) %then %return;
+
+/* avoid naming conflict for hash key vars */
+%let keyvar=%mf_getuniquename();
+%let prevkeyvar=%mf_getuniquename();
+%let lastvar=%mf_getuniquename();
+
+%if %mf_getattrn(&libds,NLOBS)=0 %then %do;
+  data &outds;
+    length hashkey $32;
+    retain hashkey "%sysfunc(md5(%str(&salt)),$hex32.)";
+    output;
+    stop;
+  run;
+  %put &sysmacroname: Dataset &libds is empty, or is not a dataset;
+  %put &sysmacroname: hashkey of &outds is based on salt (&salt) only;
+%end;
+%else %if %mf_getattrn(&libds,NLOBS)<0 %then %do;
+  %put %str(ERR)OR: Dataset &libds is not a dataset;
+%end;
+%else %do;
+  data &outds(rename=(&keyvar=hashkey) keep=&keyvar);
+    length &prevkeyvar &keyvar $32;
+    retain &prevkeyvar "%sysfunc(md5(%str(&salt)),$hex32.)";
+    set &libds end=&lastvar;
+    /* hash should include previous row */
+    &keyvar=%mp_md5(
+      cvars=%mf_getvarlist(&libds,typefilter=C) &prevkeyvar,
+      nvars=%mf_getvarlist(&libds,typefilter=N)
+    );
+    &prevkeyvar=&keyvar;
+    if &lastvar then output;
+  run;
+%end;
+%mend mp_hashdataset;
+/**
   @file
   @brief Performs a wrapped \%include
   @details This macro wrapper is necessary if you need your included code to
@@ -19224,6 +19228,7 @@ run;
     data _null_;
       set &tempds;
       if not (upcase(name) =:"DATA"); /* ignore temp datasets */
+      if not (upcase(name)=:"_DATA_");
       i+1;
       call symputx(cats('wt',i),name,'l');
       call symputx('wtcnt',i,'l');
diff --git a/base/mp_hashdataset.sas b/base/mp_hashdataset.sas
index 4904a93..5adbaa9 100644
--- a/base/mp_hashdataset.sas
+++ b/base/mp_hashdataset.sas
@@ -1,8 +1,8 @@
 /**
   @file
   @brief Returns a unique hash for a dataset
-  @details Ignores metadata attributes, used only to hash values. Compared
-  datasets must be in the same order.
+  @details Ignores metadata attributes, used only to hash values. If used to
+  compare datasets, they must have their columns and rows in the same order.
 
       %mp_hashdataset(sashelp.class,outds=myhash)
 
@@ -17,7 +17,10 @@
   @li mf_getattrn.sas
   @li mf_getuniquename.sas
   @li mf_getvarlist.sas
-  @li mf_getvartype.sas
+  @li mp_md5.sas
+
+  <h4> Related Files </h4>
+  @li mp_hashdataset.test.sas
 
   @param [in] libds dataset to hash
   @param [in] salt= Provide a salt (could be, for instance, the dataset name)
@@ -35,48 +38,48 @@
 
 %macro mp_hashdataset(
   libds,
-  outds=,
+  outds=work._data_,
   salt=,
   iftrue=%str(1=1)
 )/*/STORE SOURCE*/;
 
-  %if not(%eval(%unquote(&iftrue))) %then %return;
+%local keyvar /* roll up the md5 */
+  prevkeyvar /* retain prev record md5 */
+  lastvar /* last var in input ds */
+  cvars nvars;
 
-  %if %mf_getattrn(&libds,NLOBS)=0 %then %do;
-    %put %str(WARN)ING: Dataset &libds is empty, or is not a dataset;
-  %end;
-  %else %if %mf_getattrn(&libds,NLOBS)<0 %then %do;
-    %put %str(ERR)OR: Dataset &libds is not a dataset;
-  %end;
-  %else %do;
-    %local keyvar /* roll up the md5 */
-      prevkeyvar /* retain prev record md5 */
-      lastvar /* last var in input ds */
-      varlist var i;
-    /* avoid naming conflict for hash key vars */
-    %let keyvar=%mf_getuniquename();
-    %let prevkeyvar=%mf_getuniquename();
-    %let lastvar=%mf_getuniquename();
-    %let varlist=%mf_getvarlist(&libds);
-    data &outds(rename=(&keyvar=hashkey) keep=&keyvar);
-      length &prevkeyvar &keyvar $32;
-      retain &prevkeyvar "%sysfunc(md5(%str(&salt)),$hex32.)";
-      set &libds end=&lastvar;
-      /* hash should include previous row */
-      &keyvar=put(md5(&prevkeyvar
-      /* loop every column, hashing every individual value */
-    %do i=1 %to %sysfunc(countw(&varlist));
-      %let var=%scan(&varlist,&i,%str( ));
-      %if %mf_getvartype(&libds,&var)=C %then %do;
-          !!put(md5(trim(&var)),$hex32.)
-      %end;
-      %else %do;
-          !!put(md5(trim(put(&var*1,binary64.))),$hex32.)
-      %end;
-    %end;
-      ),$hex32.);
-      &prevkeyvar=&keyvar;
-      if &lastvar then output;
-    run;
-  %end;
-%mend mp_hashdataset;
\ No newline at end of file
+%if not(%eval(%unquote(&iftrue))) %then %return;
+
+/* avoid naming conflict for hash key vars */
+%let keyvar=%mf_getuniquename();
+%let prevkeyvar=%mf_getuniquename();
+%let lastvar=%mf_getuniquename();
+
+%if %mf_getattrn(&libds,NLOBS)=0 %then %do;
+  data &outds;
+    length hashkey $32;
+    retain hashkey "%sysfunc(md5(%str(&salt)),$hex32.)";
+    output;
+    stop;
+  run;
+  %put &sysmacroname: Dataset &libds is empty, or is not a dataset;
+  %put &sysmacroname: hashkey of &outds is based on salt (&salt) only;
+%end;
+%else %if %mf_getattrn(&libds,NLOBS)<0 %then %do;
+  %put %str(ERR)OR: Dataset &libds is not a dataset;
+%end;
+%else %do;
+  data &outds(rename=(&keyvar=hashkey) keep=&keyvar);
+    length &prevkeyvar &keyvar $32;
+    retain &prevkeyvar "%sysfunc(md5(%str(&salt)),$hex32.)";
+    set &libds end=&lastvar;
+    /* hash should include previous row */
+    &keyvar=%mp_md5(
+      cvars=%mf_getvarlist(&libds,typefilter=C) &prevkeyvar,
+      nvars=%mf_getvarlist(&libds,typefilter=N)
+    );
+    &prevkeyvar=&keyvar;
+    if &lastvar then output;
+  run;
+%end;
+%mend mp_hashdataset;
diff --git a/sasjs/sasjsconfig.json b/sasjs/sasjsconfig.json
index a88f06c..564ed75 100644
--- a/sasjs/sasjsconfig.json
+++ b/sasjs/sasjsconfig.json
@@ -71,7 +71,7 @@
     },
     {
       "name": "server",
-      "serverUrl": "https://sas.analytium.co.uk:5000",
+      "serverUrl": " ",
       "serverType": "SASJS",
       "httpsAgentOptions": {
         "allowInsecureRequests": false
diff --git a/server/ms_webout.sas b/server/ms_webout.sas
index a566116..951c85a 100644
--- a/server/ms_webout.sas
+++ b/server/ms_webout.sas
@@ -114,6 +114,7 @@
     data _null_;
       set &tempds;
       if not (upcase(name) =:"DATA"); /* ignore temp datasets */
+      if not (upcase(name)=:"_DATA_");
       i+1;
       call symputx(cats('wt',i),name,'l');
       call symputx('wtcnt',i,'l');
diff --git a/tests/crossplatform/mp_hashdataset.test.sas b/tests/crossplatform/mp_hashdataset.test.sas
new file mode 100644
index 0000000..76c3dfb
--- /dev/null
+++ b/tests/crossplatform/mp_hashdataset.test.sas
@@ -0,0 +1,59 @@
+/**
+  @file
+  @brief Testing mp_hashdataset.sas macro
+
+  <h4> SAS Macros </h4>
+  @li mp_hashdataset.sas
+  @li mp_assert.sas
+
+**/
+
+/* test 1 - regular DS */
+data work.test;
+  set sashelp.vextfl;
+  missval=.;
+  misscval='';
+run;
+
+%mp_assertscope(SNAPSHOT)
+%mp_hashdataset(test)
+%mp_assertscope(COMPARE)
+
+%mp_assert(
+  iftrue=(&syscc=0),
+  desc=Regular test works,
+  outds=work.test_results
+)
+
+%mp_hashdataset(test,outds=work.test2)
+
+%mp_assert(
+  iftrue=(&syscc=0),
+  desc=hash with output runs without errors,
+  outds=work.test_results
+)
+
+%mp_assert(
+  iftrue=(%mf_nobs(work.test2)=1),
+  desc=output has 1 row,
+  outds=work.test_results
+)
+
+
+data work.test3a;
+  set work.test;
+  stop;
+run;
+%mp_hashdataset(test3a,outds=work.test3b)
+
+%mp_assert(
+  iftrue=(&syscc=0),
+  desc=hash with zero-row input runs without errors,
+  outds=work.test_results
+)
+
+%mp_assert(
+  iftrue=(%mf_nobs(work.test3b)=1),
+  desc=test 3 output has 1 row,
+  outds=work.test_results
+)