diff --git a/arc/job/adapters/ts/heuristics.py b/arc/job/adapters/ts/heuristics.py
index ba282a3483..3bc213a268 100644
--- a/arc/job/adapters/ts/heuristics.py
+++ b/arc/job/adapters/ts/heuristics.py
@@ -1011,7 +1011,7 @@ def h_abstraction(arc_reaction: 'ARCReaction',
                     d3=d3,
                     reactants_reversed=reactants_reversed,
                 )
-            except ValueError as e:
+            except (ValueError, IndexError) as e:
                 logger.error(f'Could not generate a guess using Heuristics for H abstraction reaction, got:\n{e}')
 
             if xyz_guess is not None and not colliding_atoms(xyz_guess):
diff --git a/arc/main.py b/arc/main.py
index 050622a0b4..dd169a9e88 100644
--- a/arc/main.py
+++ b/arc/main.py
@@ -553,7 +553,7 @@ def execute(self) -> dict:
         logger.info('\n')
         for rxn in self.reactions:
             if not isinstance(rxn, ARCReaction):
-                raise ValueError(f'All reactions be ARCReaction objects. Got {type(rxn)}')
+                raise ValueError(f'All reactions must be ARCReaction objects. Got {type(rxn)}')
         self.scheduler = Scheduler(project=self.project,
                                    species_list=self.species,
                                    rxn_list=self.reactions,