diff --git a/.github/workflows/pipeline.yml b/.github/workflows/pipeline.yml
index 0db3eaf..03d9d8a 100644
--- a/.github/workflows/pipeline.yml
+++ b/.github/workflows/pipeline.yml
@@ -13,7 +13,7 @@ on:
 jobs:
   test-job:
     runs-on: ubuntu-latest
-
+    
     defaults:
       run:
         shell: bash -l {0}
@@ -23,7 +23,7 @@ jobs:
 
     env:
       CONDA_FILE: environment.yml
-
+      
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
diff --git a/CADETPythonSimulator/unit_operation.py b/CADETPythonSimulator/unit_operation.py
index e939cca..1a2a1bd 100644
--- a/CADETPythonSimulator/unit_operation.py
+++ b/CADETPythonSimulator/unit_operation.py
@@ -488,8 +488,6 @@ def compute_residual(
 
         self.residuals['outlet']['c_poly'] = self.states['outlet']['c_poly']
         self.residuals['outlet']['viscosity'] = self.states['outlet']['viscosity']
-        self.residuals['outlet']['c_poly'] = self.states['outlet']['c_poly']
-        self.residuals['outlet']['viscosity'] = self.states['outlet']['viscosity']
 
 class Outlet(UnitOperationBase):
     """System outlet."""
@@ -544,6 +542,7 @@ class Cstr(UnitOperationBase):
     }
     _state_structures = ['inlet', 'bulk']
 
+
     def compute_residual(
             self,
             t: float,