diff --git a/massfuncs/readalltxt.m b/massfuncs/readalltxt.m
index ad57f86..d141930 100644
--- a/massfuncs/readalltxt.m
+++ b/massfuncs/readalltxt.m
@@ -53,7 +53,13 @@
         for i2 = 2:Markers.nsegs(cidx)
             idx_count = idx_count + 1;
             x = [Markers.all{cidx},'_',num2str(i2)];
-            [v3{idx_count},units3] = readtxt(filename,x, wd, layers); %#ok<AGROW>
+            try 
+                [v3{idx_count},units3] = readtxt(filename,x, wd, layers); %#ok<AGROW>
+            catch
+                e_code = 19;
+                return
+            end
+            
             if ~strcmp(units3, units(cidx))
                 e_code = 16;
                 return
diff --git a/shared/err_handl_tables.m b/shared/err_handl_tables.m
index b509470..3156264 100644
--- a/shared/err_handl_tables.m
+++ b/shared/err_handl_tables.m
@@ -100,6 +100,9 @@
                 'Make sure all cell seg data files are concurrent with '...
                 'binary seg maps of their segmentation heirarchy.'];
             e_code = 1;
+        case 19
+            err_str = ['ERROR: Cell segmentation file missing'];
+            e_code = 1;
     end
     %
     %disp([sname, ';',err_str])