--- converter/other/pamtouil.c
+++ converter/other/pamtouil.c
@@ -94,7 +94,7 @@
 
         /* Remove trailing "_icon" */
         barPos = strrchr(cmdlineP->outname, '_');
-        if (strcmp(barPos, "_icon") == 0) 
+        if (barPos && strcmp(barPos, "_icon") == 0) 
             *barPos = '\0';
     } else {
         if (strcmp(cmdlineP->inputFilespec, "-") == 0)