5 files changed, 6 insertions, 5 deletions
diff --git a/src/extension/internal/cdr-input.cpp b/src/extension/internal/cdr-input.cpp
index 04087e268..0111ed626 100644
--- a/src/extension/internal/cdr-input.cpp
+++ b/src/extension/internal/cdr-input.cpp
@@ -256,8 +256,9 @@ SPDocument *CdrInput::open(Inkscape::Extension::Input * /*mod*/, const gchar * u
      }
 
      SPDocument * doc = SPDocument::createNewDocFromMem(tmpSVGOutput[page_num-1].cstr(), strlen(tmpSVGOutput[page_num-1].cstr()), TRUE);
+
      // Set viewBox if it doesn't exist
-     if (!doc->getRoot()->viewBox_set) {
+     if (doc && !doc->getRoot()->viewBox_set) {
          doc->setViewBox(Geom::Rect::from_xywh(0, 0, doc->getWidth().value(doc->getDefaultUnit()), doc->getHeight().value(doc->getDefaultUnit())));
      }
      return doc;
diff --git a/src/extension/internal/emf-inout.cpp b/src/extension/internal/emf-inout.cpp
index 67f90da91..c8c708051 100644
--- a/src/extension/internal/emf-inout.cpp
+++ b/src/extension/internal/emf-inout.cpp
@@ -3496,7 +3496,7 @@ Emf::open( Inkscape::Extension::Input * /*mod*/, const gchar *uri )
     d.tri = trinfo_release_except_FC(d.tri);
 
     // Set viewBox if it doesn't exist
-    if (!doc->getRoot()->viewBox_set) {
+    if (doc && !doc->getRoot()->viewBox_set) {
         bool saved = Inkscape::DocumentUndo::getUndoSensitive(doc);
         Inkscape::DocumentUndo::setUndoSensitive(doc, false);
         
diff --git a/src/extension/internal/pdf-input-cairo.cpp b/src/extension/internal/pdf-input-cairo.cpp
index f47fbaf87..c45367c08 100644
--- a/src/extension/internal/pdf-input-cairo.cpp
+++ b/src/extension/internal/pdf-input-cairo.cpp
@@ -625,7 +625,7 @@ PdfInputCairo::open(Inkscape::Extension::Input * /*mod*/, const gchar * uri) {
     SPDocument * doc = SPDocument::createNewDocFromMem(output->c_str(), output->length(), TRUE);
 
     // Set viewBox if it doesn't exist
-    if (!doc->getRoot()->viewBox_set) {
+    if (doc && !doc->getRoot()->viewBox_set) {
         doc->setViewBox(Geom::Rect::from_xywh(0, 0, doc->getWidth().value(doc->getDefaultUnit()), doc->getHeight().value(doc->getDefaultUnit())));
     }
 
diff --git a/src/extension/internal/wmf-inout.cpp b/src/extension/internal/wmf-inout.cpp
index e0e50cc03..3f37e4402 100644
--- a/src/extension/internal/wmf-inout.cpp
+++ b/src/extension/internal/wmf-inout.cpp
@@ -3181,7 +3181,7 @@ Wmf::open( Inkscape::Extension::Input * /*mod*/, const gchar *uri )
     d.tri = trinfo_release_except_FC(d.tri);
 
     // Set viewBox if it doesn't exist
-    if (!doc->getRoot()->viewBox_set) {
+    if (doc && !doc->getRoot()->viewBox_set) {
         bool saved = Inkscape::DocumentUndo::getUndoSensitive(doc);
         Inkscape::DocumentUndo::setUndoSensitive(doc, false);
         
diff --git a/src/extension/internal/wpg-input.cpp b/src/extension/internal/wpg-input.cpp
index b5eb3ce8f..14ff3ec77 100644
--- a/src/extension/internal/wpg-input.cpp
+++ b/src/extension/internal/wpg-input.cpp
@@ -113,7 +113,7 @@ SPDocument *WpgInput::open(Inkscape::Extension::Input * /*mod*/, const gchar * u
     SPDocument * doc = SPDocument::createNewDocFromMem(output.cstr(), strlen(output.cstr()), TRUE);
     
     // Set viewBox if it doesn't exist
-    if (!doc->getRoot()->viewBox_set) {
+    if (doc && !doc->getRoot()->viewBox_set) {
         doc->setViewBox(Geom::Rect::from_xywh(0, 0, doc->getWidth().value(doc->getDefaultUnit()), doc->getHeight().value(doc->getDefaultUnit())));
     }