diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index ad22cb85..2ab67022 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 5.2.1
+current_version = 5.2.2
 commit = True
 
 [bumpversion:file:ibm_watson/version.py]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2f86b1ef..248fa0ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+## [5.2.2](https://github.com/watson-developer-cloud/python-sdk/compare/v5.2.1...v5.2.2) (2021-07-06)
+
+
+### Bug Fixes
+
+* robustify the STT streaming results handling ([#768](https://github.com/watson-developer-cloud/python-sdk/issues/768)) ([264807d](https://github.com/watson-developer-cloud/python-sdk/commit/264807d7eb3287bbca56328496a477e042a9b2ca))
+
 ## [5.2.1](https://github.com/watson-developer-cloud/python-sdk/compare/v5.2.0...v5.2.1) (2021-06-28)
 
 
diff --git a/ibm_watson/version.py b/ibm_watson/version.py
index 4dc2ef26..7478af2c 100644
--- a/ibm_watson/version.py
+++ b/ibm_watson/version.py
@@ -1 +1 @@
-__version__ = '5.2.1'
+__version__ = '5.2.2'
diff --git a/ibm_watson/websocket/recognize_listener.py b/ibm_watson/websocket/recognize_listener.py
index 3931a252..21679760 100644
--- a/ibm_watson/websocket/recognize_listener.py
+++ b/ibm_watson/websocket/recognize_listener.py
@@ -194,18 +194,21 @@ def on_data(self, ws, message, message_type, fin):
 
         # if in streaming
         elif 'results' in json_object or 'speaker_labels' in json_object:
-            hypothesis = ''
-            if 'results' in json_object:
-                hypothesis = json_object['results'][0]['alternatives'][0][
-                    'transcript']
-                b_final = (json_object['results'][0]['final'] is True)
-                transcripts = self.extract_transcripts(
-                    json_object['results'][0]['alternatives'])
-
-                if b_final:
-                    self.callback.on_transcription(transcripts)
-
-                self.callback.on_hypothesis(hypothesis)
+            # If results are present, extract the hypothesis and, if finalized, the full
+            # set of transcriptions and send them to the appropriate callbacks.
+            results = json_object.get('results')
+            if results:
+                b_final = (results[0].get('final') is True)
+                alternatives = results[0].get('alternatives')
+                if alternatives:
+                    hypothesis = alternatives[0].get('transcript')
+                    transcripts = self.extract_transcripts(alternatives)
+                    if b_final:
+                        self.callback.on_transcription(transcripts)
+                    if hypothesis:
+                        self.callback.on_hypothesis(hypothesis)
+
+            # Always call the on_data callback if 'results' or 'speaker_labels' are present
             self.callback.on_data(json_object)
 
     def on_error(self, ws, error):
diff --git a/setup.py b/setup.py
index d8d42ea5..f3d67142 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,7 @@
 from setuptools import setup
 from os import path
 
-__version__ = '5.2.1'
+__version__ = '5.2.2'
 
 # read contents of README file
 this_directory = path.abspath(path.dirname(__file__))