diff --git a/bindings/ruby/ext/ruby_whisper.h b/bindings/ruby/ext/ruby_whisper.h
index f93cdf0c5..2dba8adcc 100644
--- a/bindings/ruby/ext/ruby_whisper.h
+++ b/bindings/ruby/ext/ruby_whisper.h
@@ -132,6 +132,21 @@ typedef struct {
 
 #define GetParakeetParams(obj, rwpp) do { \
   TypedData_Get_Struct((obj), ruby_whisper_parakeet_params, &ruby_whisper_parakeet_params_type, (rwpp)); \
+  if (!(rwpp)->new_segment_callback_container) { \
+    rb_raise(rb_eRuntimeError, "Not initialized"); \
+  } \
+  if (!(rwpp)->new_token_callback_container) { \
+    rb_raise(rb_eRuntimeError, "Not initialized"); \
+  } \
+  if (!(rwpp)->progress_callback_container) { \
+    rb_raise(rb_eRuntimeError, "Not initialized"); \
+  } \
+  if (!(rwpp)->encoder_begin_callback_container) { \
+    rb_raise(rb_eRuntimeError, "Not initialized"); \
+  } \
+  if (!(rwpp)->abort_callback_container) { \
+    rb_raise(rb_eRuntimeError, "Not initialized"); \
+  } \
 } while (0)
 
 #endif