Fix possible crash when using the QML lexer without an engine.

Change-Id: Ia7d820cf1a63eaf42041ab78e1f111d31358e4dd
Reviewed-on: http://codereview.qt.nokia.com/3779
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/src/declarative/qml/parser/qdeclarativejslexer.cpp b/src/declarative/qml/parser/qdeclarativejslexer.cpp
index b3530c0596..6015f385df 100644
--- a/src/declarative/qml/parser/qdeclarativejslexer.cpp
+++ b/src/declarative/qml/parser/qdeclarativejslexer.cpp
@@ -536,16 +536,18 @@ again:
 
         const QChar *startCode = _codePtr;
 
-        while (!_char.isNull()) {
-            if (_char == QLatin1Char('\n') || _char == QLatin1Char('\\')) {
-                break;
-            } else if (_char == quote) {
-                _tokenSpell = _engine->midRef(startCode - _code.unicode() - 1, _codePtr - startCode);
-                scanChar();
+        if (_engine) {
+            while (!_char.isNull()) {
+                if (_char == QLatin1Char('\n') || _char == QLatin1Char('\\')) {
+                    break;
+                } else if (_char == quote) {
+                    _tokenSpell = _engine->midRef(startCode - _code.unicode() - 1, _codePtr - startCode);
+                    scanChar();
 
-                return T_STRING_LITERAL;
+                    return T_STRING_LITERAL;
+                }
+                scanChar();
             }
-            scanChar();
         }
 
         _tokenText.resize(0);