исправил

code/game/dna/genes/disabilities.dm

@@ -398,18 +398,21 @@
 	..()
 	block = GLOB.aphasiablock
 
-/datum/dna/gene/disability/aphasia/activate(mob/living/carbon/human/H, flags)
+/datum/dna/gene/disability/aphasia/can_activate(mob/living/carbon/human/H, flags)
 	if(isplasmaman(H) || iswryn(H))
 		to_chat(H, span_warning("Вы чувствуете, что что-то не так, но не можете понять, что именно."))
-		return
+		return FALSE
+	. = ..()
+
+/datum/dna/gene/disability/aphasia/activate(mob/living/carbon/human/H, flags)
 	. = ..()
-	if(H.remove_language("Galactic Common"))
-		H.add_language("Galactic Common", TRUE)
-	H.dna.species.default_language = H.dna.species.language
+	if(H.remove_language(LANGUAGE_GALACTIC_COMMON))
+		H.add_language(LANGUAGE_GALACTIC_COMMON, TRUE)
+		H.dna.species.default_language = H.dna.species.language
 
 
-/datum/dna/gene/disability/aphasia/deactivate(mob/living/H, flags)
+/datum/dna/gene/disability/aphasia/deactivate(mob/living/carbon/human/H, flags)
 	. = ..()
-	if(H.remove_language("Galactic Common", TRUE))
-		H.add_language("Galactic Common")
-		H.dna.species.default_language = LANGUAGE_GALACTIC_COMMON
+	if(H.remove_language(LANGUAGE_GALACTIC_COMMON, TRUE))
+		H.add_language(LANGUAGE_GALACTIC_COMMON)
+		H.dna.species.default_language = initial(H.dna.species.default_language)

code/modules/mob/language.dm

@@ -921,9 +921,9 @@
 			return FALSE
 
 	if(only_listening)
-		. = !LAZYIN(languages_listening, new_language)
+		. = !LAZYIN(languages_only_listen, new_language)
 		if(.)
-			LAZYADD(languages_listening, new_language)
+			LAZYADD(languages_only_listen, new_language)
 	else
 		. = !LAZYIN(languages, new_language)
 		if(.)
@@ -940,9 +940,9 @@
 		if(!istype(rem_language))
 			return FALSE
 	if(only_listening)
-		. = LAZYIN(languages_listening, rem_language)
+		. = LAZYIN(languages_only_listen, rem_language)
 		if(.)
-			LAZYREMOVE(languages_listening, rem_language)
+			LAZYREMOVE(languages_only_listen, rem_language)
 	else
 		. = LAZYIN(languages, rem_language)
 		if(.)

code/modules/mob/living/carbon/human/human_say.dm

@@ -13,7 +13,7 @@
 	if(dna?.species?.can_understand(other))
 		return TRUE
 
-	if(speaking in languages_listening)
+	if(speaking in languages_only_listen)
 		return TRUE
 
 	//These only pertain to common. Languages are handled by mob/say_understands()

code/modules/mob/mob_defines.dm

@@ -91,7 +91,7 @@
 	var/exploit_record = ""
 	/// For speaking/listening.
 	var/list/datum/language/languages
-	var/list/datum/language/languages_listening // For understanding the language without ability to speak. Still can speak if lang is in /languages list
+	var/list/datum/language/languages_only_listen // For understanding the language without ability to speak. Still can speak if lang is in /languages list
 	/// For reagents that grant language knowlege.
 	var/list/temporary_languages
 	var/list/speak_emote = list("says")   // Verbs used when speaking. Defaults to 'say' if speak_emote is null.