diff --git a/lib/common/pool.c b/lib/common/pool.c
index e64833f87..a0e2bedf0 100644
--- a/lib/common/pool.c
+++ b/lib/common/pool.c
@@ -188,7 +188,6 @@ size_t POOL_sizeof(POOL_ctx *ctx) {
 /* note : only works if no job is running ! */
 static POOL_ctx* POOL_resize_internal(POOL_ctx* ctx, size_t numThreads)
 {
-    if (ctx->numThreadsBusy > 0) return NULL;
     if (numThreads <= ctx->threadCapacity) {
         ctx->threadLimit = numThreads;
         return ctx;
diff --git a/lib/compress/zstdmt_compress.c b/lib/compress/zstdmt_compress.c
index 4a2a4cdd5..bbbdc5cd4 100644
--- a/lib/compress/zstdmt_compress.c
+++ b/lib/compress/zstdmt_compress.c
@@ -1280,7 +1280,7 @@ size_t ZSTDMT_initCStream_internal(
 
     /* init */
     if (params.nbWorkers != mtctx->params.nbWorkers)
-        ZSTDMT_resize(mtctx, params.nbWorkers);
+        CHECK_F( ZSTDMT_resize(mtctx, params.nbWorkers) );
 
     if (params.jobSize == 0) {
         params.jobSize = 1U << ZSTDMT_computeTargetJobLog(params);
diff --git a/lib/decompress/zstd_decompress.c b/lib/decompress/zstd_decompress.c
index 148c87f9d..4de98a8e6 100644
--- a/lib/decompress/zstd_decompress.c
+++ b/lib/decompress/zstd_decompress.c
@@ -1108,15 +1108,11 @@ size_t ZSTD_execSequence(BYTE* op,
             return sequenceLength;
         }
         /* span extDict & currentPrefixSegment */
-        DEBUGLOG(2, "ZSTD_execSequence: found a 2-segments match")
         {   size_t const length1 = dictEnd - match;
-            DEBUGLOG(2, "first part (extDict) is %zu bytes long", length1);
             memmove(oLitEnd, match, length1);
             op = oLitEnd + length1;
             sequence.matchLength -= length1;
-            DEBUGLOG(2, "second part (prefix) is %zu bytes long", sequence.matchLength);
             match = prefixStart;
-            DEBUGLOG(2, "first byte of 2nd part : %02X", *prefixStart);
             if (op > oend_w || sequence.matchLength < MINMATCH) {
               U32 i;
               for (i = 0; i < sequence.matchLength; ++i) op[i] = match[i];