diff --git a/Core/Parsers/EventOccurrenceGrammar.cs b/Core/Parsers/EventOccurrenceGrammar.cs
index 7755aa7..81ef9c0 100644
--- a/Core/Parsers/EventOccurrenceGrammar.cs
+++ b/Core/Parsers/EventOccurrenceGrammar.cs
@@ -112,8 +112,14 @@ public static class EventOccurrenceGrammar
             var result = SectionHeader.Parse(line);
             return result;
         }
+        catch (Sprache.ParseException)
+        {
+            // Expected - line is not a section header, return null
+            return null;
+        }
         catch
         {
+            // Unexpected exception, return null to continue parsing
             return null;
         }
     }
@@ -129,8 +135,14 @@ public static class EventOccurrenceGrammar
             GeneralSchedule.Parse(line);
             return true;
         }
+        catch (Sprache.ParseException)
+        {
+            // Expected - line is not a General Schedule header
+            return false;
+        }
         catch
         {
+            // Unexpected exception, return false to continue parsing
             return false;
         }
     }
@@ -184,8 +196,14 @@ public static class EventOccurrenceGrammar
             var parsed = result.Parse(restOfLine);
             return parsed;
         }
+        catch (Sprache.ParseException)
+        {
+            // Expected - line is not a valid occurrence line, return null
+            return null;
+        }
         catch
         {
+            // Unexpected exception, return null to continue parsing
             return null;
         }
     }