diff --git a/src/oatpp-zlib/Processor.cpp b/src/oatpp-zlib/Processor.cpp
index cf76201..8994f2b 100644
--- a/src/oatpp-zlib/Processor.cpp
+++ b/src/oatpp-zlib/Processor.cpp
@@ -53,8 +53,14 @@ DeflateEncoder::DeflateEncoder(v_buff_size bufferSize, bool gzip, v_int32 compre
                        15 | 16,
                        8 /* default memory */,
                        Z_DEFAULT_STRATEGY);
+    if(res != Z_OK) {
+      OATPP_LOGE("[oatpp::zlib::DeflateEncoder::DeflateEncoder()]", "Error. Failed call to 'deflateInit2()'. Result %d", res)
+    }
   } else {
     res = deflateInit(&m_zStream, compressionLevel);
+    if(res != Z_OK) {
+      OATPP_LOGE("[oatpp::zlib::DeflateEncoder::DeflateEncoder()]", "Error. Failed call to 'deflateInit()'. Result %d", res)
+    }
   }
 
   if(res != Z_OK) {
@@ -66,7 +72,7 @@ DeflateEncoder::DeflateEncoder(v_buff_size bufferSize, bool gzip, v_int32 compre
 DeflateEncoder::~DeflateEncoder() {
   v_int32 res = deflateEnd(&m_zStream);
   if(res != Z_OK) {
-    OATPP_LOGE("[oatpp::zlib::DeflateEncoder::~DeflateEncoder()]", "Error. Failed call to 'deflateEnd()'.")
+    OATPP_LOGE("[oatpp::zlib::DeflateEncoder::~DeflateEncoder()]", "Error. Failed call to 'deflateEnd()'. Result %d", res)
   }
 }
 
@@ -185,8 +191,14 @@ DeflateDecoder::DeflateDecoder(v_buff_size bufferSize, bool gzip)
 
   if(gzip) {
     res = inflateInit2(&m_zStream, 15 | 16);
+    if(res != Z_OK) {
+      OATPP_LOGE("[oatpp::zlib::DeflateDecoder::DeflateDecoder()]", "Error. Failed call to 'inflateInit2()'. Result %d", res)
+    }
   } else {
     res = inflateInit(&m_zStream);
+    if(res != Z_OK) {
+      OATPP_LOGE("[oatpp::zlib::DeflateDecoder::DeflateDecoder()]", "Error. Failed call to 'inflateInit()'. Result %d", res)
+    }
   }
 
   if(res != Z_OK) {
@@ -198,7 +210,7 @@ DeflateDecoder::DeflateDecoder(v_buff_size bufferSize, bool gzip)
 DeflateDecoder::~DeflateDecoder() {
   v_int32 res = inflateEnd(&m_zStream);
   if(res != Z_OK) {
-    OATPP_LOGE("[oatpp::zlib::DeflateDecoder::~DeflateDecoder()]", "Error. Failed call to 'inflateEnd()'.")
+    OATPP_LOGE("[oatpp::zlib::DeflateDecoder::~DeflateDecoder()]", "Error. Failed call to 'inflateEnd()'. Result %d", res)
   }
 }