diff -ur imlib2-1.6.1-orig/src/lib/grab.c imlib2-1.6.1/src/lib/grab.c
--- imlib2-1.6.1-orig/src/lib/grab.c	2019-12-08 09:38:38.000000000 -0500
+++ imlib2-1.6.1/src/lib/grab.c	2020-11-10 09:52:37.058039176 -0500
@@ -714,13 +714,19 @@
              cols[i].pixel = i;
              cols[i].flags = DoRed | DoGreen | DoBlue;
           }
-        XQueryColors(d, cm, cols, 1 << xatt.depth);
-        for (i = 0; i < (1 << xatt.depth); i++)
+        XQueryColors(d, cm, cols, xatt.visual->map_entries);
+        for (i = 0; i < xatt.visual->map_entries; i++)
           {
              rtab[i] = cols[i].red >> 8;
              gtab[i] = cols[i].green >> 8;
              btab[i] = cols[i].blue >> 8;
           }
+        for (i = xatt.visual->map_entries; i < (1 << xatt.depth); i++)
+          {
+             rtab[i] = 0;
+             gtab[i] = 0;
+             btab[i] = 0;
+          }
      }
    __imlib_GrabXImageToRGBA(data, ox + clipx, oy + clipy, ow, oh,
                             d, xim, mxim, v, xatt.depth, x, y, w, h, 0);