diff --git a/CMakeLists.txt b/CMakeLists.txt
index 920e1026..bf2c8e4a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,7 @@ set ( PACKAGE "fluidsynth" )
 # FluidSynth package version
 set ( FLUIDSYNTH_VERSION_MAJOR 2 )
 set ( FLUIDSYNTH_VERSION_MINOR 0 )
-set ( FLUIDSYNTH_VERSION_MICRO 2 )
+set ( FLUIDSYNTH_VERSION_MICRO 3 )
 set ( VERSION "${FLUIDSYNTH_VERSION_MAJOR}.${FLUIDSYNTH_VERSION_MINOR}.${FLUIDSYNTH_VERSION_MICRO}" )
 set ( FLUIDSYNTH_VERSION "\"${VERSION}\"" )
 
@@ -43,8 +43,8 @@ set ( FLUIDSYNTH_VERSION "\"${VERSION}\"" )
 # if any interfaces have been removed/changed (compatibility broken): AGE=0
 # This is not exactly the same algorithm as the libtool one, but the results are the same.
 set ( LIB_VERSION_CURRENT 2 )
-set ( LIB_VERSION_AGE 0 )
-set ( LIB_VERSION_REVISION 2 )
+set ( LIB_VERSION_AGE 1 )
+set ( LIB_VERSION_REVISION 0 )
 set ( LIB_VERSION_INFO
       "${LIB_VERSION_CURRENT}.${LIB_VERSION_AGE}.${LIB_VERSION_REVISION}" )
 
diff --git a/doc/Doxyfile b/doc/Doxyfile
index 7f3b2f46..4558d926 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -5,7 +5,7 @@
 #---------------------------------------------------------------------------
 DOXYFILE_ENCODING = UTF-8
 PROJECT_NAME = libfluidsynth
-PROJECT_NUMBER = 2.0.2
+PROJECT_NUMBER = 2.0.3
 OUTPUT_DIRECTORY = api
 CREATE_SUBDIRS = NO
 OUTPUT_LANGUAGE = English
diff --git a/doc/fluidsynth-v20-devdoc.txt b/doc/fluidsynth-v20-devdoc.txt
index 75428b85..f578a8fa 100644
--- a/doc/fluidsynth-v20-devdoc.txt
+++ b/doc/fluidsynth-v20-devdoc.txt
@@ -7,9 +7,9 @@
 \author Josh Green
 \author David Henningsson
 \author Tom Moebert
-\author Copyright © 2003-2018 Peter Hanappe, Conrad Berhörster, Antoine Schmitt, Pedro López-Cabanillas, Josh Green, David Henningsson, Tom Moebert
-\version Revision 2.0.2
-\date 2018-11-18
+\author Copyright © 2003-2019 Peter Hanappe, Conrad Berhörster, Antoine Schmitt, Pedro López-Cabanillas, Josh Green, David Henningsson, Tom Moebert
+\version Revision 2.0.3
+\date 2019-01-01
 
 All the source code examples in this document are in the public domain; you can use them as you please. This document is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/ . The FluidSynth library is distributed under the GNU Lesser General Public License. A copy of the GNU Lesser General Public License is contained in the FluidSynth package; if not, visit http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt or write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
@@ -64,6 +64,7 @@ What is FluidSynth?
 
 \section NewIn2_0_3 Whats new in 2.0.3?
 
+- fix incorrect behaviour of fluid_sample_set_sound_data()
 - add missing getters for midi events:
   - fluid_midi_event_get_text()
   - fluid_midi_event_get_lyrics()
diff --git a/include/fluidsynth/sfont.h b/include/fluidsynth/sfont.h
index 55413a9e..0df4d6d4 100644
--- a/include/fluidsynth/sfont.h
+++ b/include/fluidsynth/sfont.h
@@ -184,12 +184,10 @@ typedef void (*fluid_sfont_iteration_start_t)(fluid_sfont_t *sfont);
 /**
  * Virtual SoundFont preset iteration function.
  * @param sfont Virtual SoundFont
- * @param preset Caller supplied uninitialized buffer to fill in with current preset information
  * @return NULL when no more presets are available, otherwise the a pointer to the current preset
  *
- * Should store preset information to the caller supplied \a preset structure
- * and advance the internal iteration state to the next preset for subsequent
- * calls.
+ * Returns preset information to the caller. The returned buffer is only valid until a subsequent
+ * call to this function.
  */
 typedef fluid_preset_t *(*fluid_sfont_iteration_next_t)(fluid_sfont_t *sfont);
 
diff --git a/src/fluidsynth.c b/src/fluidsynth.c
index 427c5541..bc0ed245 100644
--- a/src/fluidsynth.c
+++ b/src/fluidsynth.c
@@ -1034,7 +1034,7 @@ void
 print_welcome()
 {
     printf("FluidSynth runtime version %s\n"
-           "Copyright (C) 2000-2018 Peter Hanappe and others.\n"
+           "Copyright (C) 2000-2019 Peter Hanappe and others.\n"
            "Distributed under the LGPL license.\n"
            "SoundFont(R) is a registered trademark of E-mu Systems, Inc.\n\n",
            fluid_version_str());
diff --git a/src/midi/fluid_midi.c b/src/midi/fluid_midi.c
index 59ad3173..1a394f81 100644
--- a/src/midi/fluid_midi.c
+++ b/src/midi/fluid_midi.c
@@ -94,13 +94,13 @@ int fluid_is_midifile(const char *filename)
 {
     FILE    *fp = FLUID_FOPEN(filename, "rb");
     uint32_t id;
-    int      retcode = 0;
+    int      retcode = FALSE;
 
     do
     {
         if(fp == NULL)
         {
-            break;
+            return retcode;
         }
 
         if(FLUID_FREAD(&id, sizeof(id), 1, fp) != 1)
diff --git a/src/sfloader/fluid_sffile.c b/src/sfloader/fluid_sffile.c
index 0725e1f3..302eea72 100644
--- a/src/sfloader/fluid_sffile.c
+++ b/src/sfloader/fluid_sffile.c
@@ -336,13 +336,13 @@ int fluid_is_soundfont(const char *filename)
 {
     FILE    *fp = FLUID_FOPEN(filename, "rb");
     uint32_t fcc;
-    int      retcode = 0;
+    int      retcode = FALSE;
 
     do
     {
         if(fp == NULL)
         {
-            break;
+            return retcode;
         }
 
         if(FLUID_FREAD(&fcc, sizeof(fcc), 1, fp) != 1)
diff --git a/src/sfloader/fluid_sfont.c b/src/sfloader/fluid_sfont.c
index 405bec6c..548a80ab 100644
--- a/src/sfloader/fluid_sfont.c
+++ b/src/sfloader/fluid_sfont.c
@@ -512,9 +512,13 @@ delete_fluid_sample(fluid_sample_t *sample)
 /**
  * Returns the size of the fluid_sample_t structure.
  *
- * Useful in low latency scenarios e.g. to allocate a sample on the stack.
+ * Useful in low latency scenarios e.g. to allocate a pool of samples.
  *
  * @return Size of fluid_sample_t in bytes
+ * 
+ * @note It is recommend to zero initialize the memory before using the object.
+ * 
+ * @warning Do NOT allocate samples on the stack and assign them to a voice!
  */
 size_t fluid_sample_sizeof()
 {
@@ -563,16 +567,17 @@ fluid_sample_set_sound_data(fluid_sample_t *sample,
 
     fluid_return_val_if_fail(sample != NULL, FLUID_FAILED);
     fluid_return_val_if_fail(data != NULL, FLUID_FAILED);
-    fluid_return_val_if_fail(nbframes == 0, FLUID_FAILED);
+    fluid_return_val_if_fail(nbframes != 0, FLUID_FAILED);
 
     /* in case we already have some data */
     if((sample->data != NULL || sample->data24 != NULL) && sample->auto_free)
     {
         FLUID_FREE(sample->data);
         FLUID_FREE(sample->data24);
-        sample->data = NULL;
-        sample->data24 = NULL;
     }
+    
+    sample->data = NULL;
+    sample->data24 = NULL;
 
     if(copy_data)
     {
@@ -635,6 +640,8 @@ error_rec:
     FLUID_LOG(FLUID_ERR, "Out of memory");
     FLUID_FREE(sample->data);
     FLUID_FREE(sample->data24);
+    sample->data = NULL;
+    sample->data24 = NULL;
     return FLUID_FAILED;
 
 #undef SAMPLE_LOOP_MARGIN
diff --git a/src/sfloader/fluid_sfont.h b/src/sfloader/fluid_sfont.h
index 24773353..28609e96 100644
--- a/src/sfloader/fluid_sfont.h
+++ b/src/sfloader/fluid_sfont.h
@@ -183,8 +183,6 @@ struct _fluid_sample_t
      * @return Should return #FLUID_OK
      */
     int (*notify)(fluid_sample_t *sample, int reason);
-
-    void *userdata;       /**< User defined data */
 };
 
 
diff --git a/src/utils/fluid_sys.c b/src/utils/fluid_sys.c
index 4ac1344b..d686737f 100644
--- a/src/utils/fluid_sys.c
+++ b/src/utils/fluid_sys.c
@@ -1214,7 +1214,11 @@ fluid_istream_readline(fluid_istream_t in, fluid_ostream_t out, char *prompt,
 
         FLUID_SNPRINTF(buf, len, "%s", line);
         buf[len - 1] = 0;
-        add_history(buf);
+
+        if(buf[0] != '\0')
+        {
+            add_history(buf);
+        }
 
         free(line);
         return 1;