fix biome choosing

src/world/generator/WorldGenerator.cpp

@@ -133,11 +133,12 @@ static inline const Biome* choose_biome(
             score += glm::abs((params[i] - biome.parameters[i].value) / 
                               biome.parameters[i].weight);
         }
-        if (score < chosenScore) {
+        if (score < chosenScore || std::isinf(chosenScore)) {
             chosenScore = score;
             chosenBiome = &biome;
         }
     }
+    assert(chosenBiome != nullptr);
     return chosenBiome;
 }