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-rw-r--r--lib/stwcs/wcsutil/altwcs.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/stwcs/wcsutil/altwcs.py b/lib/stwcs/wcsutil/altwcs.py
index befa2bb..bdb9b3b 100644
--- a/lib/stwcs/wcsutil/altwcs.py
+++ b/lib/stwcs/wcsutil/altwcs.py
@@ -350,7 +350,8 @@ def deleteWCS(fname, ext, wcskey=" ", wcsname=" "):
if hwcs is None:
continue
for k in hwcs.keys():
- del hdr[k]
+ if k in hdr:
+ del hdr[k]
#del hdr['ORIENT'+wkey]
prexts.append(i)
if prexts != []: