diff --git a/vpi/sys_lxt.c b/vpi/sys_lxt.c
index 1fadd3945..29b4d0cf0 100644
--- a/vpi/sys_lxt.c
+++ b/vpi/sys_lxt.c
@@ -730,13 +730,13 @@ static PLI_INT32 sys_dumpvars_calltf(PLI_BYTE8*name)
       if (dump_file == 0) {
 	    open_dumpfile(callh);
 	    if (dump_file == 0) {
-		  vpi_free_object(argv);
+		  if (argv) vpi_free_object(argv);
 		  return 0;
 	    }
       }
 
       if (install_dumpvars_callback()) {
-	    vpi_free_object(argv);
+	    if (argv) vpi_free_object(argv);
 	    return 0;
       }
 
diff --git a/vpi/sys_lxt2.c b/vpi/sys_lxt2.c
index e8c36e219..2b89d96c4 100644
--- a/vpi/sys_lxt2.c
+++ b/vpi/sys_lxt2.c
@@ -785,13 +785,13 @@ static PLI_INT32 sys_dumpvars_calltf(PLI_BYTE8*name)
       if (dump_file == 0) {
 	    open_dumpfile(callh);
 	    if (dump_file == 0) {
-		  vpi_free_object(argv);
+		  if (argv) vpi_free_object(argv);
 		  return 0;
 	    }
       }
 
       if (install_dumpvars_callback()) {
-	    vpi_free_object(argv);
+	    if (argv) vpi_free_object(argv);
 	    return 0;
       }
 
diff --git a/vpi/sys_vcd.c b/vpi/sys_vcd.c
index 027c89817..9e044e462 100644
--- a/vpi/sys_vcd.c
+++ b/vpi/sys_vcd.c
@@ -755,13 +755,13 @@ static PLI_INT32 sys_dumpvars_calltf(PLI_BYTE8*name)
       if (dump_file == 0) {
 	    open_dumpfile(callh);
 	    if (dump_file == 0) {
-		  vpi_free_object(argv);
+		  if (argv) vpi_free_object(argv);
 		  return 0;
 	    }
       }
 
       if (install_dumpvars_callback()) {
-	    vpi_free_object(argv);
+	    if (argv) vpi_free_object(argv);
 	    return 0;
       }