Index: trunk/stac/src/stacCombine.c
===================================================================
--- trunk/stac/src/stacCombine.c	(revision 3666)
+++ trunk/stac/src/stacCombine.c	(revision 3673)
@@ -67,4 +67,13 @@
     )
 {
+    assert(combined);
+    assert(images);
+    assert(errors);
+    assert(images->n == errors->n);
+    assert(saturated);
+    assert(bad);
+    assert(saturated->n == images->n);
+    assert(bad->n == images->n);
+
     int nImages = images->n;		// Number of images
     int numRows = ((psImage*)images->data[0])->numRows;	// Image size