diff --git a/ca/ca2100.cpp b/ca/ca2100.cpp
index b14b988f7..3cf65bd8d 100755
--- a/ca/ca2100.cpp
+++ b/ca/ca2100.cpp
@@ -533,7 +533,8 @@ bool TMovanal_msk::row2rec(int r, TRectype& rec) const
       if (idx < 17)
       {
         const char* s = row.get(idx);
-        fr->write(s, rec);
+        if (s != NULL)
+          fr->write(s, rec);
       }
     }
   }