diff --git a/mozilla/embedding/components/printingui/src/mac/nsPrintingPromptService.cpp b/mozilla/embedding/components/printingui/src/mac/nsPrintingPromptService.cpp
index 51154552ce6..38df51ea2a6 100644
--- a/mozilla/embedding/components/printingui/src/mac/nsPrintingPromptService.cpp
+++ b/mozilla/embedding/components/printingui/src/mac/nsPrintingPromptService.cpp
@@ -509,11 +509,15 @@ nsPrintingPromptService::ShowPrinterProperties(nsIDOMWindow *parent, const PRUni
 NS_IMETHODIMP 
 nsPrintingPromptService::OnStateChange(nsIWebProgress *aWebProgress, nsIRequest *aRequest, PRUint32 aStateFlags, nsresult aStatus)
 {
-    if (aStateFlags & STATE_STOP) 
+    if ((aStateFlags & STATE_STOP) && mWebProgressListener) 
     {
         mWebProgressListener->OnStateChange(aWebProgress, aRequest, aStateFlags, aStatus);
-        mPrintProgress->CloseProgressDialog(PR_TRUE);
-        mPrintProgress = nsnull;
+        if (mPrintProgress) 
+        {
+            mPrintProgress->CloseProgressDialog(PR_TRUE);
+        }
+        mPrintProgress       = nsnull;
+        mWebProgressListener = nsnull;
     }
     return NS_OK;
 }
diff --git a/mozilla/embedding/components/printingui/src/mac/nsPrintingPromptServiceX.cpp b/mozilla/embedding/components/printingui/src/mac/nsPrintingPromptServiceX.cpp
index ffebc4bee7e..f0d3dbaa0bc 100644
--- a/mozilla/embedding/components/printingui/src/mac/nsPrintingPromptServiceX.cpp
+++ b/mozilla/embedding/components/printingui/src/mac/nsPrintingPromptServiceX.cpp
@@ -370,11 +370,15 @@ nsPrintingPromptService::ShowPrinterProperties(nsIDOMWindow *parent, const PRUni
 NS_IMETHODIMP 
 nsPrintingPromptService::OnStateChange(nsIWebProgress *aWebProgress, nsIRequest *aRequest, PRUint32 aStateFlags, nsresult aStatus)
 {
-    if (aStateFlags & STATE_STOP) 
+    if ((aStateFlags & STATE_STOP) && mWebProgressListener) 
     {
         mWebProgressListener->OnStateChange(aWebProgress, aRequest, aStateFlags, aStatus);
-        mPrintProgress->CloseProgressDialog(PR_TRUE);
-        mPrintProgress = nsnull;
+        if (mPrintProgress) 
+        {
+            mPrintProgress->CloseProgressDialog(PR_TRUE);
+        }
+        mPrintProgress       = nsnull;
+        mWebProgressListener = nsnull;
     }
     return NS_OK;
 }
diff --git a/mozilla/embedding/components/printingui/src/os2/nsPrintingPromptService.cpp b/mozilla/embedding/components/printingui/src/os2/nsPrintingPromptService.cpp
index 10398e083f4..b0cc61239d8 100644
--- a/mozilla/embedding/components/printingui/src/os2/nsPrintingPromptService.cpp
+++ b/mozilla/embedding/components/printingui/src/os2/nsPrintingPromptService.cpp
@@ -285,10 +285,13 @@ nsPrintingPromptService::DoDialog(nsIDOMWindow *aParent,
 NS_IMETHODIMP 
 nsPrintingPromptService::OnStateChange(nsIWebProgress *aWebProgress, nsIRequest *aRequest, PRUint32 aStateFlags, nsresult aStatus)
 {
-  if (aStateFlags & STATE_STOP) {
+  if ((aStateFlags & STATE_STOP) && mWebProgressListener) {
     mWebProgressListener->OnStateChange(aWebProgress, aRequest, aStateFlags, aStatus);
-    mPrintProgress->CloseProgressDialog(PR_TRUE);
-    mPrintProgress = nsnull;
+    if (mPrintProgress) {
+      mPrintProgress->CloseProgressDialog(PR_TRUE);
+    }
+    mPrintProgress       = nsnull;
+    mWebProgressListener = nsnull;
   }
   return NS_OK;
 }
diff --git a/mozilla/embedding/components/printingui/src/unixshared/nsPrintingPromptService.cpp b/mozilla/embedding/components/printingui/src/unixshared/nsPrintingPromptService.cpp
index 60171181e34..99405969970 100644
--- a/mozilla/embedding/components/printingui/src/unixshared/nsPrintingPromptService.cpp
+++ b/mozilla/embedding/components/printingui/src/unixshared/nsPrintingPromptService.cpp
@@ -291,10 +291,13 @@ nsPrintingPromptService::DoDialog(nsIDOMWindow *aParent,
 NS_IMETHODIMP 
 nsPrintingPromptService::OnStateChange(nsIWebProgress *aWebProgress, nsIRequest *aRequest, PRUint32 aStateFlags, nsresult aStatus)
 {
-  if (aStateFlags & STATE_STOP) {
+  if ((aStateFlags & STATE_STOP) && mWebProgressListener) {
     mWebProgressListener->OnStateChange(aWebProgress, aRequest, aStateFlags, aStatus);
-    mPrintProgress->CloseProgressDialog(PR_TRUE);
-    mPrintProgress = nsnull;
+    if (mPrintProgress) {
+      mPrintProgress->CloseProgressDialog(PR_TRUE);
+    }
+    mPrintProgress       = nsnull;
+    mWebProgressListener = nsnull;
   }
   return NS_OK;
 }