From 57821c7bea0c0dd04101425fa0693cff2bfda7fe Mon Sep 17 00:00:00 2001
From: Richard Berger <richard.berger@temple.edu>
Date: Thu, 4 Jun 2020 16:26:22 -0400
Subject: [PATCH] Add missing error message

---
 src/potential_file_reader.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/potential_file_reader.cpp b/src/potential_file_reader.cpp
index aff1ce2f01..c6c58ede36 100644
--- a/src/potential_file_reader.cpp
+++ b/src/potential_file_reader.cpp
@@ -42,6 +42,9 @@ PotentialFileReader::PotentialFileReader(LAMMPS *lmp,
 
   try {
     reader = open_potential(filename);
+    if(!reader) {
+      error->one(FLERR, fmt::format("cannot open {} potential file {}", potential_name, filename).c_str());
+    }
   } catch (FileReaderException & e) {
     error->one(FLERR, e.what());
   }