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--- a/src/qtgui/restable.cpp
+++ b/src/qtgui/restable.cpp
@@ -675,6 +675,8 @@
 				     tr("Save table to CSV file"),
 				     QString::fromLocal8Bit(path_home().c_str())
 	    );
+    if (s.isEmpty())
+	return;
     const char *tofile = s.toLocal8Bit();
     FILE *fp = fopen(tofile, "w");
     if (fp == 0) {