diff --git a/docs/user-guide/xml/xml-filters.tex b/docs/user-guide/xml/xml-filters.tex
index 8537eb3464bd05ea86c4b29ec5b5e05536eb90cc..86b57cd53c89b081aeafa4511878fa736b947864 100644
--- a/docs/user-guide/xml/xml-filters.tex
+++ b/docs/user-guide/xml/xml-filters.tex
@@ -282,7 +282,7 @@ Filter \inltt{Electrogram} computes virtual unipolar electrograms at a
 
 \subsection{Error}\label{filters:Error}
 
-This filter produces a CSV file containing the time-evolution of the $L_2$ and
+This filter produces a file containing the time-evolution of the $L_2$ and
 $L_{inf}$ errors. By default this file is called \inltt{session.err} where
 \inltt{session} is the session name.
 
diff --git a/library/SolverUtils/Filters/FilterError.cpp b/library/SolverUtils/Filters/FilterError.cpp
index a51c2d4e319309e29d884c1951b51bd743e80358..bd5ffca8478690f76579fa5b2a1199806ce13fb3 100644
--- a/library/SolverUtils/Filters/FilterError.cpp
+++ b/library/SolverUtils/Filters/FilterError.cpp
@@ -64,10 +64,10 @@ FilterError::FilterError(const LibUtilities::SessionReaderSharedPtr &pSession,
     outName += ".err";
 
     // Lock equation system pointer
-    m_equationShPtr = pEquation.lock();
-    ASSERTL0(m_equationShPtr, "Weak pointer expired");
+    auto equationSys = m_equ.lock();
+    ASSERTL0(equationSys, "Weak pointer expired");
 
-    m_numVariables = m_equationShPtr->GetNvariables();
+    m_numVariables = equationSys->GetNvariables();
 
     m_comm = pSession->GetComm();
     if (m_comm->GetRank() == 0)
@@ -79,9 +79,9 @@ FilterError::FilterError(const LibUtilities::SessionReaderSharedPtr &pSession,
         m_outFile << "Time";
         for (size_t i = 0; i < m_numVariables; ++i)
         {
-            std::string varName = m_equationShPtr->GetVariable(i);
-            m_outFile << "," + varName + " L2"
-                      << "," + varName + " Linf";
+            std::string varName = equationSys->GetVariable(i);
+            m_outFile << " " + varName + "_L2"
+                      << " " + varName + "_Linf";
         }
 
         m_outFile << std::endl;
@@ -125,19 +125,23 @@ void FilterError::v_Update(
         m_outFile << time;
     }
 
+    // Lock equation system pointer
+    auto equationSys = m_equ.lock();
+    ASSERTL0(equationSys, "Weak pointer expired");
+
     for (size_t i = 0; i < m_numVariables; ++i)
     {
-        Array<OneD, NekDouble> exactsoln(m_equationShPtr->GetTotPoints(), 0.0);
+        Array<OneD, NekDouble> exactsoln(equationSys->GetTotPoints(), 0.0);
 
         // Evaluate "ExactSolution" function, or zero array
-        m_equationShPtr->EvaluateExactSolution(i, exactsoln, time);
+        equationSys->EvaluateExactSolution(i, exactsoln, time);
 
-        NekDouble vL2Error   = m_equationShPtr->L2Error(i, exactsoln);
-        NekDouble vLinfError = m_equationShPtr->LinfError(i, exactsoln);
+        NekDouble vL2Error   = equationSys->L2Error(i, exactsoln);
+        NekDouble vLinfError = equationSys->LinfError(i, exactsoln);
 
         if (m_comm->GetRank() == 0)
         {
-            m_outFile << "," << vL2Error << "," << vLinfError;
+            m_outFile << " " << vL2Error << " " << vLinfError;
         }
     }
 
diff --git a/library/SolverUtils/Filters/FilterError.h b/library/SolverUtils/Filters/FilterError.h
index 803a387293e5f2437d0cd1035cec8a7776bdbdb7..496716d5a1c488f4c18ee9514471750438b122bd 100644
--- a/library/SolverUtils/Filters/FilterError.h
+++ b/library/SolverUtils/Filters/FilterError.h
@@ -84,7 +84,6 @@ private:
     size_t m_numVariables;
     std::ofstream m_outFile;
     LibUtilities::CommSharedPtr m_comm;
-    std::shared_ptr<EquationSystem> m_equationShPtr;
 };
 } // namespace SolverUtils
 } // namespace Nektar