1 files changed, 8 insertions, 0 deletions
diff --git a/src/document.cpp b/src/document.cpp
index a2d7a32cb..3daae3deb 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -102,6 +102,7 @@ SPDocument::SPDocument() :
     root(nullptr),
     style_cascade(cr_cascade_new(nullptr, nullptr, nullptr)),
     style_sheet(nullptr),
+    ref_count(0),
     uri(nullptr),
     base(nullptr),
     name(nullptr),
@@ -594,12 +595,19 @@ SPDocument *SPDocument::createNewDocFromMem(gchar const *buffer, gint length, un
 
 SPDocument *SPDocument::doRef()
 {
+    ++ref_count;
+    // std::cout << "SPDocument::doRef() " << ref_count << " " << this << std::endl;
     Inkscape::GC::anchor(this);
     return this;
 }
 
 SPDocument *SPDocument::doUnref()
 {
+    --ref_count;
+    if (ref_count < 0) {
+        std::cerr << "SPDocument::doUnref(): invalid ref count! " << ref_count << std::endl;
+    }
+    // std::cout << "SPDocument::doUnref() " << ref_count << " " << this << std::endl;
     Inkscape::GC::release(this);
     return nullptr;
 }