Check if m->env is NULL before dereferencing it; fix #3436

76135e75 · Yukihiro "Matz" Matsumoto · b277c58e · 76135e75
Commit 76135e75 authored Feb 08, 2017 by Yukihiro "Matz" Matsumoto
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src/vm.c src/vm.c +3 -1

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--- a/src/vm.c
+++ b/src/vm.c
@@ -1309,7 +1309,9 @@ RETRY_TRY_BLOCK:
        else {
          stack_extend(mrb, irep->nregs, ci->argc+2);
        }
-        regs[0] = m->env->stack[0];
+        if(m->env) {
+          regs[0] = m->env->stack[0];
+        }
        pc = irep->iseq;
        JUMP;
      }