diff --git a/core/src/com/unciv/models/ruleset/Ruleset.kt b/core/src/com/unciv/models/ruleset/Ruleset.kt
index 179eba4d0f..f79944267d 100644
--- a/core/src/com/unciv/models/ruleset/Ruleset.kt
+++ b/core/src/com/unciv/models/ruleset/Ruleset.kt
@@ -251,6 +251,8 @@ class Ruleset {
                 lines += "${building.name} requires resource ${building.requiredResource} which does not exist!"
             if (building.replaces != null && !buildings.containsKey(building.replaces!!))
                 lines += "${building.name} replaces ${building.replaces} which does not exist!"
+            if (building.requiredTech == null && building.cost == 0)
+                lines += "${building.name} must either have an explicit cost or reference an existing tech!"
         }
 
         for (resource in tileResources.values) {
diff --git a/core/src/com/unciv/ui/utils/ImageGetter.kt b/core/src/com/unciv/ui/utils/ImageGetter.kt
index 3e27181ec2..9d6c79cc0f 100644
--- a/core/src/com/unciv/ui/utils/ImageGetter.kt
+++ b/core/src/com/unciv/ui/utils/ImageGetter.kt
@@ -272,7 +272,7 @@ object ImageGetter {
     fun getResourceImage(resourceName: String, size:Float): Actor {
         val iconGroup = getImage("ResourceIcons/$resourceName").surroundWithCircle(size)
         val resource = ruleset.tileResources[resourceName]
-        if (resource == null) throw Exception("No resource $resourceName found in ruleset!")
+        if (resource == null) return iconGroup // This is the result of a bad modding setup, just give em an empty circle. Their problem.
         iconGroup.circle.color = getColorFromStats(resource)
 
         if (resource.resourceType == ResourceType.Luxury) {