Check for primaryFont in LayoutTextControl::getAvgCharWidth

third_party/WebKit/Source/core/layout/LayoutTextControl.cpp

Index: third_party/WebKit/Source/core/layout/LayoutTextControl.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutTextControl.cpp b/third_party/WebKit/Source/core/layout/LayoutTextControl.cpp
index e8ee104847271c40bf0e0a1bf8b00699bf61c968..e183ae86c67ecc69fcacbebf9695245b02574798 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTextControl.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutTextControl.cpp
@@ -216,8 +216,9 @@ bool LayoutTextControl::hasValidAvgCharWidth(const SimpleFontData* font, const A
 float LayoutTextControl::getAvgCharWidth(const AtomicString& family) const
 {
     const Font& font = style()->font();
+
     const SimpleFontData* primaryFont = font.primaryFont();
-    if (hasValidAvgCharWidth(primaryFont, family))
+    if (primaryFont && hasValidAvgCharWidth(primaryFont, family))
         return roundf(primaryFont->avgCharWidth());
 
     const UChar ch = '0';