diff --git a/launcher/BaseInstance.cpp b/launcher/BaseInstance.cpp
index 2fb31d94..0240afa8 100644
--- a/launcher/BaseInstance.cpp
+++ b/launcher/BaseInstance.cpp
@@ -59,7 +59,7 @@ BaseInstance::BaseInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr s
     m_settings->registerSetting("lastLaunchTime", 0);
     m_settings->registerSetting("totalTimePlayed", 0);
     m_settings->registerSetting("lastTimePlayed", 0);
-    m_settings->registerSetting("InstanceType", "OneSix");
+    m_settings->registerSetting("InstanceType", "");
 
     // Custom Commands
     auto commandSetting = m_settings->registerSetting({"OverrideCommands","OverrideLaunchCmd"}, false);
diff --git a/launcher/InstanceList.cpp b/launcher/InstanceList.cpp
index 847d897e..3e3c81f7 100644
--- a/launcher/InstanceList.cpp
+++ b/launcher/InstanceList.cpp
@@ -547,8 +547,20 @@ InstancePtr InstanceList::loadInstance(const InstanceId& id)
     auto instanceRoot = FS::PathCombine(m_instDir, id);
     auto instanceSettings = std::make_shared<INISettingsObject>(FS::PathCombine(instanceRoot, "instance.cfg"));
     InstancePtr inst;
-    // TODO: Handle incompatible instances
-    inst.reset(new MinecraftInstance(m_globalSettings, instanceSettings, instanceRoot));
+
+    instanceSettings->registerSetting("InstanceType", "");
+
+    QString inst_type = instanceSettings->get("InstanceType").toString();
+
+    // NOTE: Some PolyMC versions didn't save the InstanceType properly. We will just bank on the probability that this is probably a OneSix instance
+    if (inst_type == "OneSix" || inst_type.isEmpty())
+    {
+        inst.reset(new MinecraftInstance(m_globalSettings, instanceSettings, instanceRoot));
+    }
+    else
+    {
+        inst.reset(new NullInstance(m_globalSettings, instanceSettings, instanceRoot));
+    }
     qDebug() << "Loaded instance " << inst->name() << " from " << inst->instanceRoot();
     return inst;
 }
diff --git a/launcher/minecraft/MinecraftInstance.cpp b/launcher/minecraft/MinecraftInstance.cpp
index 2f339014..e99d30fe 100644
--- a/launcher/minecraft/MinecraftInstance.cpp
+++ b/launcher/minecraft/MinecraftInstance.cpp
@@ -168,6 +168,8 @@ MinecraftInstance::MinecraftInstance(SettingsObjectPtr globalSettings, SettingsO
     m_settings->registerOverride(globalSettings->getSetting("CloseAfterLaunch"), miscellaneousOverride);
     m_settings->registerOverride(globalSettings->getSetting("QuitAfterGameStop"), miscellaneousOverride);
 
+    m_settings->set("InstanceType", "OneSix");
+
     m_components.reset(new PackProfile(this));
 }