diff --git a/source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/CatalogueSource.kt b/source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/CatalogueSource.kt
index 66ae67b67..20bbdc8fa 100644
--- a/source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/CatalogueSource.kt
+++ b/source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/CatalogueSource.kt
@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.source
 
+import dev.icerock.moko.graphics.BuildConfig
 import eu.kanade.tachiyomi.source.model.FilterList
 import eu.kanade.tachiyomi.source.model.MangasPage
 import eu.kanade.tachiyomi.source.model.SManga
@@ -123,7 +124,17 @@ interface CatalogueSource : Source {
     ) {
         runCatching { fetchRelatedMangaList(manga) }
             .onSuccess { if (it.isNotEmpty()) pushResults(Pair("", it), false) }
-            .onFailure { e -> logcat(LogPriority.ERROR, e) { "## getRelatedMangaListByExtension: $e" } }
+            .onFailure { e ->
+                @Suppress("KotlinConstantConditions")
+                if (BuildConfig.BUILD_TYPE == "release") {
+                    logcat(LogPriority.ERROR, e) { "## getRelatedMangaListByExtension: $e" }
+                } else {
+                    throw UnsupportedOperationException(
+                        "Extension doesn't support site's related entries," +
+                            " please report an issue to Komikku."
+                    )
+                }
+            }
     }
 
     /**