diff --git a/rtengine/imagedata.cc b/rtengine/imagedata.cc
index c3b177734..9bf1b1210 100644
--- a/rtengine/imagedata.cc
+++ b/rtengine/imagedata.cc
@@ -320,7 +320,9 @@ FramesData::FramesData(const Glib::ustring &fname, time_t ts) :
             //orientation = pos->print(&exif);
         }
 
-        if (find_exif_tag("Exif.NikonLd4.LensIDNumber") || find_exif_tag("Exif.Sony2.LensID")) {
+        if ((find_exif_tag("Exif.NikonLd4.LensID") && pos->toLong()) ||
+            (find_exif_tag("Exif.NikonLd4.LensIDNumber") && pos->toLong()) ||
+            (find_exif_tag("Exif.Sony2.LensID") && pos->toLong())) {
             lens = validateUft8(pos->print(&exif));
         } else if (find_tag(Exiv2::lensName)) {
             lens = validateUft8(pos->print(&exif));