diff -up ImageMagick-6.9.10-68/coders/svg.c.freeze ImageMagick-6.9.10-68/coders/svg.c
--- ImageMagick-6.9.10-68/coders/svg.c.freeze	2019-11-11 12:30:05.611595848 +0100
+++ ImageMagick-6.9.10-68/coders/svg.c	2019-11-11 12:28:36.574295494 +0100
@@ -1679,6 +1679,12 @@ static void SVGStartElement(void *contex
                       value);
                     break;
                   }
+		else 
+		  {
+		    // empty class name
+                    (void) FormatLocaleFile(svg_info->file,"class \"\"\n");
+                    break;
+		  }
               }
               break;
             }