diff --git a/libavcodec/psymodel.c b/libavcodec/psymodel.c
index f87dbcf277..88a76f5b6b 100644
--- a/libavcodec/psymodel.c
+++ b/libavcodec/psymodel.c
@@ -117,11 +117,14 @@ void ff_psy_preprocess(struct FFPsyPreprocessContext *ctx,
 
 av_cold void ff_psy_preprocess_end(struct FFPsyPreprocessContext *ctx)
 {
+    if (ctx) {
     int i;
     ff_iir_filter_free_coeffs(ctx->fcoeffs);
     if (ctx->fstate)
         for (i = 0; i < ctx->avctx->channels; i++)
             ff_iir_filter_free_state(ctx->fstate[i]);
     av_freep(&ctx->fstate);
+    }
+    ctx = NULL;
 }