only return false if the structure is not a wall or palisade

community-mod/simulation/components/Foundation.js

@@ -102,10 +102,11 @@ Foundation.prototype.GetNumBuilders = function()
 };
 
 Foundation.prototype.IsFinished = function () {
-	if (this.GetBuildProgress() == 1.0 && this.entsToDestroy)
+	if (this.GetBuildProgress() == 1.0 && this.entsToDestroy) {
 		for (let ent of this.entsToDestroy)
 			Engine.DestroyEntity(ent);
-
+		this.entsToDestroy = [];
+	}
 	return this.GetBuildProgress() == 1.0;
 };
 
@@ -267,7 +268,10 @@ Foundation.prototype.Commit = function () {
 
 				// TODO: What if an obstruction has no UnitAI?
 			}
-
+			if (this.finalTemplateName.indexOf("wall") === -1 && this.finalTemplateName.indexOf("palisades") === -1) {
+				warn()
+				return false;
+			}
 			// TODO: maybe we should tell the builder to use a special
 			// animation to indicate they're waiting for people to get
 			// out the way