diff -up Cbc-releases-2.10.4/Cbc/src/Cbc_C_Interface.cpp.orig Cbc-releases-2.10.4/Cbc/src/Cbc_C_Interface.cpp
--- Cbc-releases-2.10.4/Cbc/src/Cbc_C_Interface.cpp.orig	2020-01-31 04:34:18.000000000 -0700
+++ Cbc-releases-2.10.4/Cbc/src/Cbc_C_Interface.cpp	2020-02-20 11:57:30.731295819 -0700
@@ -870,7 +870,7 @@ Cbc_solve(Cbc_Model *model)
   try {
 
     CbcMain1((int)argv.size(), &argv[0], *model->model_, NULL, *model->cbcData);
-  } catch (CoinError e) {
+  } catch (CoinError& e) {
     printf("%s ERROR: %s::%s, %s\n", prefix,
       e.className().c_str(), e.methodName().c_str(), e.message().c_str());
   }
diff -up Cbc-releases-2.10.4/Cbc/test/OsiCbcSolverInterfaceTest.cpp.orig Cbc-releases-2.10.4/Cbc/test/OsiCbcSolverInterfaceTest.cpp
--- Cbc-releases-2.10.4/Cbc/test/OsiCbcSolverInterfaceTest.cpp.orig	2020-01-31 04:34:18.000000000 -0700
+++ Cbc-releases-2.10.4/Cbc/test/OsiCbcSolverInterfaceTest.cpp	2020-02-20 11:57:30.731295819 -0700
@@ -124,7 +124,7 @@ void OsiCbcSolverInterfaceUnitTest(const
       try {
         solver.setObjCoeff(0, 0.0);
         OSIUNITTEST_ADD_OUTCOME("cbc", "setObjCoeff on empty model", "should throw exception", OsiUnitTest::TestOutcome::ERROR, false);
-      } catch (CoinError e) {
+      } catch (CoinError& e) {
         if (OsiUnitTest::verbosity >= 1)
           std::cout << "Correct throw from setObjCoeff on empty model" << std::endl;
       }
@@ -138,7 +138,7 @@ void OsiCbcSolverInterfaceUnitTest(const
         double value[] = { 0.0, 0.0, 0.0, 0.0 };
         solver.setColSetBounds(index, index + 2, value);
         OSIUNITTEST_ADD_OUTCOME("cbc", "setColSetBounds on cols not in model", "should throw exception", OsiUnitTest::TestOutcome::ERROR, false);
-      } catch (CoinError e) {
+      } catch (CoinError& e) {
         if (OsiUnitTest::verbosity >= 1)
           std::cout << "Correct throw from setObjCoeff on empty model" << std::endl;
       }