1 files changed, 1 insertions, 1 deletions
diff --git a/proc.c b/proc.c
index 415ad1c201..59b3fd3abc 100644
--- a/proc.c
+++ b/proc.c
@@ -536,7 +536,7 @@ rb_proc_call_with_block(VALUE self, int argc, VALUE *argv, VALUE pass_procval)
     }
 
     return vm_invoke_proc(GET_THREAD(), proc, proc->block.self,
-			  argc, argv, &pass_proc->block);
+			  argc, argv, (pass_proc ? &pass_proc->block : 0));
 }
 
 /*