Add a null pointer check before getting the family name of the given color space in CPDF_ColorSpace…

core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp

Index: core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
index 6c2701f5f703dce656baa81280aabf73a55d3821..672887660bdb4e70d692e44c47bb7bc3576c54e4 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
@@ -1096,7 +1096,11 @@ CPDF_ColorSpace* CPDF_ColorSpace::Load(CPDF_Document* pDoc, CPDF_Object* pObj)
     if (pArray->GetCount() == 0) {
         return NULL;
     }
-    CFX_ByteString familyname = pArray->GetElementValue(0)->GetString();
+    CPDF_Object *pFamilyObj = pArray->GetElementValue(0);
+    if (!pFamilyObj) {
+        return NULL;
+    }
+    CFX_ByteString familyname = pFamilyObj->GetString();
     if (pArray->GetCount() == 1) {
         return _CSFromName(familyname);
     }