diff --git a/src/logic/scripting/lua/libs/libaudio.cpp b/src/logic/scripting/lua/libs/libaudio.cpp
index ba8595af1..31be7553f 100644
--- a/src/logic/scripting/lua/libs/libaudio.cpp
+++ b/src/logic/scripting/lua/libs/libaudio.cpp
@@ -8,7 +8,7 @@ inline const char* DEFAULT_CHANNEL = "regular";
 
 inline int extract_channel_index(lua::State* L, int idx) {
     const char* channel = DEFAULT_CHANNEL;
-    if (!lua::isnoneornil(L, idx)) {
+    if (lua::isstring(L, idx)) {
         channel = lua::tostring(L, idx);
     }
     int index = audio::get_channel_index(channel);
@@ -121,7 +121,7 @@ static int l_audio_play_stream(lua::State* L) {
     return lua::pushinteger(
         L,
         static_cast<lua::Integer>(play_stream(
-            lua::tostring(L, 1),
+            lua::require_string(L, 1),
             false,
             lua::tonumber(L, 2),
             lua::tonumber(L, 3),
@@ -144,7 +144,7 @@ static int l_audio_play_stream_2d(lua::State* L) {
     return lua::pushinteger(
         L,
         static_cast<lua::Integer>(play_stream(
-            lua::tostring(L, 1),
+            lua::require_string(L, 1),
             true,
             0.0,
             0.0,
@@ -170,7 +170,7 @@ static int l_audio_play_sound(lua::State* L) {
     return lua::pushinteger(
         L,
         static_cast<lua::Integer>(play_sound(
-            lua::tostring(L, 1),
+            lua::require_string(L, 1),
             false,
             lua::tonumber(L, 2),
             lua::tonumber(L, 3),
@@ -193,7 +193,7 @@ static int l_audio_play_sound_2d(lua::State* L) {
     return lua::pushinteger(
         L,
         static_cast<lua::Integer>(play_sound(
-            lua::tostring(L, 1),
+            lua::require_string(L, 1),
             true,
             0.0,
             0.0,