diff --git a/Serializer.cxx b/Serializer.cxx
index b4ebab76f..fab11a378 100644
--- a/Serializer.cxx
+++ b/Serializer.cxx
@@ -201,6 +201,10 @@ Serializer::Deserialize(Phreeqc &phreeqc_ref, Dictionary &dictionary, std::vecto
 #if !defined(R_SO)
 			std::cerr << "Unknown pack type in deserialize " << type << std::endl;
 			exit(4);
+#else
+			std::ostringstream oss;
+			oss << "Unknown pack type in deserialize " << type << std::endl;
+			phreeqc_ref.error_msg(oss.str().c_str(), STOP);
 #endif
 			break;
 		}
diff --git a/common/Utils.cxx b/common/Utils.cxx
index 6738fa9d4..b2585a565 100644
--- a/common/Utils.cxx
+++ b/common/Utils.cxx
@@ -199,13 +199,17 @@ strcpy_safe(char* dest, size_t max, const char* src)
 	{
 		if (dest == nullptr || src == nullptr)
 		{
+#if !defined(R_SO)
 			std::cerr << "nullptr in Utilities::strcpy_safe." << std::endl;
+#endif
 			throw;
 		}
 		lsrc = strlen(src);
 		if (lsrc + 1 > max)
 		{
+#if !defined(R_SO)
 			std::cerr << "Buffer overrun in Utilities::strcpy_safe." << std::endl;
+#endif
 			throw;
 		}
 		memcpy(dest, src, (lsrc + 1) * sizeof(char));
@@ -224,14 +228,18 @@ strcat_safe(char* dest, size_t max, const char* src)
 	{
 		if (dest == nullptr || src == nullptr)
 		{
+#if !defined(R_SO)
 			std::cerr << "nullptr in Utilities::strcat_safe." << std::endl;
+#endif
 			throw;
 		}
 		lsrc = strlen(src);
 		ldest = strlen(dest);
 		if (ldest + lsrc + 1 > max)
 		{
+#if !defined(R_SO)
 			std::cerr << "Buffer overrun in Utilities::strcat_safe." << std::endl;
+#endif
 			throw;
 		}
 		memcpy(&dest[ldest], src, (lsrc + 1) * sizeof(char));