diff --git a/js/src/asmjs/AsmJS.cpp b/js/src/asmjs/AsmJS.cpp
index f81894041258..652d0859c950 100644
--- a/js/src/asmjs/AsmJS.cpp
+++ b/js/src/asmjs/AsmJS.cpp
@@ -2630,16 +2630,6 @@ class MOZ_STACK_CLASS FunctionValidator
         hasAlreadyReturned_(false)
     {}
 
-    ~FunctionValidator() {
-        if (m_.hasAlreadyFailed())
-            return;
-        MOZ_ASSERT(!blockDepth_);
-        MOZ_ASSERT(breakableStack_.empty());
-        MOZ_ASSERT(continuableStack_.empty());
-        MOZ_ASSERT(breakLabels_.empty());
-        MOZ_ASSERT(continueLabels_.empty());
-    }
-
     ModuleValidator& m() const        { return m_; }
     ExclusiveContext* cx() const      { return m_.cx(); }
     ParseNode* fn() const             { return fn_; }
@@ -2656,6 +2646,11 @@ class MOZ_STACK_CLASS FunctionValidator
     }
 
     bool finish(uint32_t funcIndex, unsigned generateTime) {
+        MOZ_ASSERT(!blockDepth_);
+        MOZ_ASSERT(breakableStack_.empty());
+        MOZ_ASSERT(continuableStack_.empty());
+        MOZ_ASSERT(breakLabels_.empty());
+        MOZ_ASSERT(continueLabels_.empty());
         return m_.mg().finishFuncDef(funcIndex, generateTime, &fg_);
     }
 
diff --git a/js/src/jit-test/tests/asm.js/testBug1255954.js b/js/src/jit-test/tests/asm.js/testBug1255954.js
new file mode 100644
index 000000000000..7379a9b8aefe
--- /dev/null
+++ b/js/src/jit-test/tests/asm.js/testBug1255954.js
@@ -0,0 +1,10 @@
+const USE_ASM = '"use asm";';
+function asmCompile() {
+    var f = Function.apply(null, arguments);
+}
+oomTest(() => {
+    try {
+        function f(b) {}
+    } catch (exc0) {}
+    f(asmCompile(USE_ASM + "function f() { var i=42; return i|0; for(;1;) {} return 0 } return f"));
+});