diff --git a/all.sas b/all.sas
index 35b79e8..2e580d4 100644
--- a/all.sas
+++ b/all.sas
@@ -312,13 +312,17 @@ https://github.com/yabwon/SAS_PACKAGES/blob/main/packages/baseplus.md#functionex
   %local dsid rc;
   %let dsid=%sysfunc(open(&libds,is));
 
-  %if &dsid=0 or %length(&var)=0 %then %do;
+  %if &dsid=0 %then %do;
     %put %sysfunc(sysmsg());
-      0
+    0
+  %end;
+  %else %if %length(&var)=0 %then %do;
+    0
+    %let rc=%sysfunc(close(&dsid));
   %end;
   %else %do;
-      %sysfunc(varnum(&dsid,&var))
-      %let rc=%sysfunc(close(&dsid));
+    %sysfunc(varnum(&dsid,&var))
+    %let rc=%sysfunc(close(&dsid));
   %end;
 
 %mend mf_existvar;
diff --git a/base/mf_existvar.sas b/base/mf_existvar.sas
index 368cd97..f156940 100755
--- a/base/mf_existvar.sas
+++ b/base/mf_existvar.sas
@@ -25,13 +25,17 @@
   %local dsid rc;
   %let dsid=%sysfunc(open(&libds,is));
 
-  %if &dsid=0 or %length(&var)=0 %then %do;
+  %if &dsid=0 %then %do;
     %put %sysfunc(sysmsg());
-      0
+    0
+  %end;
+  %else %if %length(&var)=0 %then %do;
+    0
+    %let rc=%sysfunc(close(&dsid));
   %end;
   %else %do;
-      %sysfunc(varnum(&dsid,&var))
-      %let rc=%sysfunc(close(&dsid));
+    %sysfunc(varnum(&dsid,&var))
+    %let rc=%sysfunc(close(&dsid));
   %end;
 
 %mend mf_existvar;
diff --git a/tests/base/mf_existvar.test.sas b/tests/base/mf_existvar.test.sas
index 18e5dff..d71cbcc 100644
--- a/tests/base/mf_existvar.test.sas
+++ b/tests/base/mf_existvar.test.sas
@@ -17,4 +17,24 @@
 %mp_assert(
   iftrue=(%mf_existvar(sashelp.class,isjustanumber)=0),
   desc=Checking non existing var does not exist
+)
+
+data work.lockcheck;
+  a=1;
+  output;
+  stop;
+run;
+
+%mp_assert(
+  iftrue=(%mf_existvar(work.lockcheck,)=0),
+  desc=Checking non-provided var does not exist
+)
+
+proc sql;
+update work.lockcheck set a=2;
+
+%mp_assert(
+  iftrue=(&syscc=0),
+  desc=Checking the lock was released,
+  outds=work.test_results
 )
\ No newline at end of file