diff --git a/pyproject.toml b/pyproject.toml
index 019889e..b6b5777 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "rda_python_common"
-version = "1.0.44"
+version = "1.0.45"
 authors = [
   { name="Zaihua Ji", email="zji@ucar.edu" },
 ]
diff --git a/src/rda_python_common/PgFile.py b/src/rda_python_common/PgFile.py
index 204c834..2e2eee1 100644
--- a/src/rda_python_common/PgFile.py
+++ b/src/rda_python_common/PgFile.py
@@ -1664,7 +1664,7 @@ def local_file_stat(file, fstat, opt, logact):
    if opt&8:
       info['gid'] = fstat.st_gid
       info['group'] = grp.getgrgid(info['gid']).gr_name
-   if opt&32: info['checksum'] = get_md5sum(file, 0, logact)
+   if opt&32 and info['isfile']: info['checksum'] = get_md5sum(file, 0, logact)
 
    return info
 
@@ -2305,16 +2305,18 @@ def get_md5sum(file, count = 0, logact = 0):
    if count > 0:
       checksum = [None]*count
       for i in range(count):
-         chksm = PgLOG.pgsystem(cmd + file[i], logact, 20)
-         if chksm:
-            ms = re.search(r'(\w{32})', chksm)
-            if ms: checksum[i] = ms.group(1)
+         if op.isfile(file[i]):
+            chksm = PgLOG.pgsystem(cmd + file[i], logact, 20)
+            if chksm:
+               ms = re.search(r'(\w{32})', chksm)
+               if ms: checksum[i] = ms.group(1)
    else:
-      chksm = PgLOG.pgsystem(cmd + file, logact, 20)
       checksum = None
-      if chksm:
-         ms = re.search(r'(\w{32})', chksm)
-         if ms: checksum = ms.group(1)
+      if op.isfile(file):
+         chksm = PgLOG.pgsystem(cmd + file, logact, 20)
+         if chksm:
+            ms = re.search(r'(\w{32})', chksm)
+            if ms: checksum = ms.group(1)
 
    return checksum
 
diff --git a/src/rda_python_common/PgLOG.py b/src/rda_python_common/PgLOG.py
index b7756e0..d48fe46 100644
--- a/src/rda_python_common/PgLOG.py
+++ b/src/rda_python_common/PgLOG.py
@@ -474,7 +474,7 @@ def write_message(msg, file, logact):
       if logact&BRKLIN: OUT.write("\n")
       if logact&SEPLIN: OUT.write(PGLOG['SEPLINE'])
    OUT.write(msg)
-   if errlog and not logact&(EMLALL|SKPTRC): OUT.write(get_call_trace())
+   if errlog and file and not logact&(EMLALL|SKPTRC): OUT.write(get_call_trace())
    if doclose: OUT.close()
 
 #