diff --git a/pwiz_tools/Skyline/Model/SmallMoleculeTransitionListReader.cs b/pwiz_tools/Skyline/Model/SmallMoleculeTransitionListReader.cs
index 6a39469779..dbbd19f317 100644
--- a/pwiz_tools/Skyline/Model/SmallMoleculeTransitionListReader.cs
+++ b/pwiz_tools/Skyline/Model/SmallMoleculeTransitionListReader.cs
@@ -254,6 +254,15 @@ private bool ErrorAddingToExistingMoleculeGroup(ref SrmDocument document, Parsed
             return false;
         }
 
+        // Check for the various kinds of exceptions that may be thrown in the course of
+        // parsing sometimes-wonky user data
+        private bool IsParserException(Exception exception)
+        {
+            return exception is InvalidOperationException
+                   || exception is InvalidDataException
+                   || exception is ArgumentException;
+        }
+
         // Returns true on error
         private bool ErrorFindingTransitionGroupForPrecursor(ref SrmDocument document, ParsedIonInfo precursor, Row row,
             PeptideGroupDocNode pepGroup, Adduct adduct, double precursorMonoMz, double precursorAverageMz,
@@ -296,13 +305,9 @@ private bool ErrorFindingTransitionGroupForPrecursor(ref SrmDocument document, P
                                     _firstAddedPathPepGroup = _firstAddedPathPepGroup ?? pathGroup;
                                 }
                             }
-                            catch (InvalidDataException x)
-                            {
-                                errmsg = x.Message;
-                            }
-                            catch (InvalidOperationException x) // Adduct handling code can throw these
+                            catch (Exception exception) when (IsParserException(exception))
                             {
-                                errmsg = x.Message;
+                                errmsg = exception.Message;
                             }
 
                             if (errmsg != null)
@@ -1357,7 +1362,7 @@ private ParsedIonInfo ReadPrecursorOrProductColumns(SrmDocument document,
                             adduct = DetermineAdductFromFormulaChargeAndMz(formula, charge.Value, mz);
                         }
                     }
-                    catch (Exception e)
+                    catch (Exception e) when (IsParserException(e))
                     {
                         ShowTransitionError(new PasteError
                         {
@@ -1511,13 +1516,9 @@ private ParsedIonInfo ReadPrecursorOrProductColumns(SrmDocument document,
                             }
                         }
                     }
-                    catch (InvalidDataException x)
+                    catch (Exception exception) when (IsParserException(exception))
                     {
-                        massErrMsg = x.Message;
-                    }
-                    catch (InvalidOperationException x)  // Adduct handling code can throw these
-                    {
-                        massErrMsg = x.Message;
+                        massErrMsg = exception.Message;
                     }
                     if (massErrMsg != null)
                     {
@@ -1704,7 +1705,7 @@ private bool ProcessAdduct(Row row, int indexAdduct, int indexFormula, bool getP
                 adduct = Adduct.FromStringAssumeChargeOnly(adductText);
                 IonInfo.ApplyAdductToFormula(formula ?? string.Empty, adduct); // Just to see if it throws
             }
-            catch (Exception x) when ((x is InvalidOperationException) || (x is ArgumentException))
+            catch (Exception x) when (IsParserException(x))
             {
                 ShowTransitionError(new PasteError
                 {
@@ -1831,7 +1832,7 @@ private PeptideDocNode GetMoleculePeptide(SrmDocument document, Row row, Peptide
                     molecule = new CustomMolecule(parsedIonInfo.MonoMass, parsedIonInfo.AverageMass, shortName, parsedIonInfo.MoleculeID.AccessionNumbers);
                 }
             }
-            catch (ArgumentException e)
+            catch (Exception e) when (IsParserException(e))
             {
                 ShowTransitionError(new PasteError
                 {
@@ -1849,7 +1850,7 @@ private PeptideDocNode GetMoleculePeptide(SrmDocument document, Row row, Peptide
                     return null;
                 return new PeptideDocNode(pep, document.Settings, null, null, parsedIonInfo.ExplicitRetentionTime, new[] { tranGroup }, false);
             }
-            catch (InvalidOperationException e)
+            catch (Exception e) when (IsParserException(e))
             {
                 ShowTransitionError(new PasteError
                 {
@@ -1908,11 +1909,7 @@ private TransitionGroupDocNode GetMoleculeTransitionGroup(SrmDocument document,
                 return new TransitionGroupDocNode(group, document.Annotations, document.Settings, null,
                     null, moleculeInfo.ExplicitTransitionGroupValues, null, new[] { tran }, false);
             }
-            catch (InvalidDataException x)
-            {
-                errmsg = x.Message;
-            }
-            catch (InvalidOperationException x) // Adduct handling code can throw these
+            catch (Exception x) when (IsParserException(x))
             {
                 errmsg = x.Message;
             }