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-rw-r--r--layout/base/nsDocumentViewer.cpp6
1 files changed, 6 insertions, 0 deletions
diff --git a/layout/base/nsDocumentViewer.cpp b/layout/base/nsDocumentViewer.cpp
index a1105ae52..782ac332c 100644
--- a/layout/base/nsDocumentViewer.cpp
+++ b/layout/base/nsDocumentViewer.cpp
@@ -544,6 +544,12 @@ nsDocumentViewer::~nsDocumentViewer()
mDocument->Destroy();
}
+ if (mPrintEngine) {
+ mPrintEngine->Destroy();
+ mPrintEngine = nullptr;
+ }
+
+ MOZ_RELEASE_ASSERT(mDestroyRefCount == 0);
NS_ASSERTION(!mPresShell && !mPresContext,
"User did not call nsIContentViewer::Destroy");
if (mPresShell || mPresContext) {