diff --git a/ObservationSim/ObservationSim.py b/ObservationSim/ObservationSim.py
index 9f852ba9fcd741cd9e9aa1a6325bdd7d34935fea..05e77fc64e71f1fab4db04a2e4aeacd6af612ab8 100755
--- a/ObservationSim/ObservationSim.py
+++ b/ObservationSim/ObservationSim.py
@@ -68,8 +68,7 @@ class Observation(object):
             chip_output.Log_error("unrecognized PSF model type!!", flush=True)
 
         # Figure out shear fields
-        if shear_cat_file is not None:
-            self.g1_field, self.g2_field, self.nshear = get_shear_field(config=self.config, shear_cat_file=shear_cat_file)
+        self.g1_field, self.g2_field, self.nshear = get_shear_field(config=self.config, shear_cat_file=shear_cat_file)
 
         # Apply astrometric simulation for pointing
         if self.config["obs_setting"]["enable_astrometric_model"]:
diff --git a/profile_C6.sh b/profile_C6.sh
index d21ea74fd4a6751a85d0d3eb738a0d031e4ccb41..a64e6a3d1ea434bc68a3d5f78cf4a2d31baefb2d 100755
--- a/profile_C6.sh
+++ b/profile_C6.sh
@@ -3,10 +3,10 @@
 date
 
 python -m cProfile -o C6_profiler_test.pstats /share/home/fangyuedong/csst-simulation/run_sim.py \
-    --config_file config_C6_test_wcs.yaml \
-    --catalog wcs_test_C6 \
+    --config_file config_C6.yaml \
+    --catalog C6_Catalog \
     -c /share/home/fangyuedong/csst-simulation/config
     # --config_file test_fd_C6.yaml \
     # --catalog fd_test_C6 \
-    # --config_file config_C6.yaml \
-    # --catalog C6_Catalog \
+    # --config_file config_C6_test_wcs.yaml \
+    # --catalog wcs_test_C6 \