--- a/js/src/frontend/BytecodeCompiler.cpp
+++ b/js/src/frontend/BytecodeCompiler.cpp
@@ -324,22 +324,22 @@ BytecodeCompiler::deoptimizeArgumentsInE
 
 JSScript*
 BytecodeCompiler::compileScript(HandleObject environment, SharedContext* sc)
 {
     if (!createSourceAndParser(ParseGoal::Script)) {
         return nullptr;
     }
 
-    TokenStreamPosition startPosition(keepAtoms, parser->tokenStream);
-
     if (!createScript()) {
         return nullptr;
     }
 
+    TokenStreamPosition startPosition(keepAtoms, parser->tokenStream);
+
     Maybe<BytecodeEmitter> emitter;
     if (!emplaceEmitter(emitter, sc)) {
         return nullptr;
     }
 
     for (;;) {
         ParseNode* pn;
         {