diff --git a/ppd/raster-interpret.c b/ppd/raster-interpret.c
index de3a38cc..ad0b456b 100644
--- a/ppd/raster-interpret.c
+++ b/ppd/raster-interpret.c
@@ -1203,6 +1203,9 @@ ppd_scan_ps(_ppd_ps_stack_t  *st,	// I  - Stack
   int			parens;		// Parenthesis nesting level
 
 
+  if (!*ptr)
+    return (NULL);
+
   //
   // Skip leading whitespace...
   //