Index: trunk/Ohana/src/opihi/cmd.data/impeaks.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.data/impeaks.c	(revision 36679)
+++ trunk/Ohana/src/opihi/cmd.data/impeaks.c	(revision 40398)
@@ -100,4 +100,5 @@
   int Npeaks = 0;
   for (ix = 1; ix < Nx - 1; ix++) {
+    if (!isfinite(row[ix])) continue; // ignore NAN values
     if (row[ix] <  threshold) continue;   // only accept pixels above threshold
     if (row[ix] <  row[ix - 1]) continue; // peak pixel must be at least preceeding pixel