diff --git a/src/api/plugin/plugin.cpp b/src/api/plugin/plugin.cpp
index 7a92027a..6b448b63 100644
--- a/src/api/plugin/plugin.cpp
+++ b/src/api/plugin/plugin.cpp
@@ -160,26 +160,27 @@ bool Plugin::LoadsArchive() const {
 }
 
 bool Plugin::DoFormIDsOverlap(const PluginInterface& plugin) const {
-  // Assume the PluginInterface is another plugin: it'll throw if it's not.
-  // Not great design, but the function needs getFormIds() and that can't
-  // be exposed in the interface.
-  const Plugin& otherPlugin = dynamic_cast<const Plugin&>(plugin);
+  try {
+    auto otherPlugin = dynamic_cast<const Plugin&>(plugin);
 
-  //Basically std::set_intersection except with an early exit instead of an append to results.
-  set<FormId> formIds(getFormIds());
-  set<FormId> otherFormIds(otherPlugin.getFormIds());
-  auto i = begin(formIds);
-  auto j = begin(otherFormIds);
-  auto iend = end(formIds);
-  auto jend = end(otherFormIds);
+    //Basically std::set_intersection except with an early exit instead of an append to results.
+    set<FormId> formIds(getFormIds());
+    set<FormId> otherFormIds(otherPlugin.getFormIds());
+    auto i = begin(formIds);
+    auto j = begin(otherFormIds);
+    auto iend = end(formIds);
+    auto jend = end(otherFormIds);
 
-  while (i != iend && j != jend) {
-    if (*i < *j)
-      ++i;
-    else if (*j < *i)
-      ++j;
-    else
-      return true;
+    while (i != iend && j != jend) {
+      if (*i < *j)
+        ++i;
+      else if (*j < *i)
+        ++j;
+      else
+        return true;
+    }
+  } catch (std::bad_cast& e) {
+    BOOST_LOG_TRIVIAL(error) << "Tried to check if FormIDs overlapped with a non-Plugin implementation of PluginInterface.";
   }
 
   return false;
diff --git a/src/tests/api/internals/plugin/plugin_test.h b/src/tests/api/internals/plugin/plugin_test.h
index 25d71eec..07016af7 100644
--- a/src/tests/api/internals/plugin/plugin_test.h
+++ b/src/tests/api/internals/plugin/plugin_test.h
@@ -79,6 +79,22 @@ protected:
   const std::string blankSuffixArchive;
 };
 
+class OtherPluginType : public PluginInterface {
+public:
+  std::string GetName() const { return ""; }
+  std::string GetLowercasedName() const { return ""; }
+  std::string GetVersion() const { return ""; }
+  std::vector<std::string> GetMasters() const { return std::vector<std::string>(); }
+  std::vector<Message> GetStatusMessages() const { return std::vector<Message>(); }
+  std::set<Tag> GetBashTags() const { return std::set<Tag>(); }
+  uint32_t GetCRC() const { return 0; }
+
+  bool IsMaster() const { return false; }
+  bool IsEmpty() const { return false; }
+  bool LoadsArchive() const { return false; }
+  bool DoFormIDsOverlap(const PluginInterface& plugin) const { return true; }
+};
+
 // Pass an empty first argument, as it's a prefix for the test instantation,
 // but we only have the one so no prefix is necessary.
 INSTANTIATE_TEST_CASE_P(,
@@ -216,6 +232,14 @@ TEST_P(PluginTest, lessThanOperatorShouldUseCaseInsensitiveLexicographicalNameCo
   EXPECT_FALSE(plugin4 < plugin3);
 }
 
+TEST_P(PluginTest, doFormIDsOverlapShouldReturnFalseIfTheArgumentIsNotAPluginObject) {
+  Plugin plugin1(game_, blankEsm, false);
+  OtherPluginType plugin2;
+
+  EXPECT_FALSE(plugin1.DoFormIDsOverlap(plugin2));
+  EXPECT_TRUE(plugin2.DoFormIDsOverlap(plugin1));
+}
+
 TEST_P(PluginTest, doFormIDsOverlapShouldReturnFalseForTwoPluginsWithOnlyHeadersLoaded) {
   Plugin plugin1(game_, blankEsm, true);
   Plugin plugin2(game_, blankMasterDependentEsm, true);