diff --git a/lldb/examples/python/crashlog.py b/lldb/examples/python/crashlog.py
--- a/lldb/examples/python/crashlog.py
+++ b/lldb/examples/python/crashlog.py
@@ -83,6 +83,7 @@
             self.registers = dict()
             self.reason = None
             self.queue = None
+            self.crashed = False
             self.app_specific_backtrace = app_specific_backtrace
 
         def dump(self, prefix):
@@ -160,6 +161,9 @@
                 print()
                 for reg in self.registers.keys():
                     print("    %-8s = %#16.16x" % (reg, self.registers[reg]))
+            elif self.crashed:
+               print()
+               print("No thread state (register information) available")
 
         def add_ident(self, ident):
             if ident not in self.idents:
@@ -505,8 +509,10 @@
                 thread.reason = json_thread['name']
             if json_thread.get('triggered', False):
                 self.crashlog.crashed_thread_idx = idx
-                thread.registers = self.parse_thread_registers(
-                    json_thread['threadState'])
+                thread.crashed = True
+                if 'threadState' in json_thread:
+                    thread.registers = self.parse_thread_registers(
+                        json_thread['threadState'])
             thread.queue = json_thread.get('queue')
             self.parse_frames(thread, json_thread.get('frames', []))
             self.crashlog.threads.append(thread)
diff --git a/lldb/test/Shell/ScriptInterpreter/Python/Crashlog/Inputs/no_threadState.ips b/lldb/test/Shell/ScriptInterpreter/Python/Crashlog/Inputs/no_threadState.ips
new file mode 100644
--- /dev/null
+++ b/lldb/test/Shell/ScriptInterpreter/Python/Crashlog/Inputs/no_threadState.ips
@@ -0,0 +1,104 @@
+{"app_name":"json.test.tmp.out","timestamp":"2021-03-08 13:57:06.00 -0800","app_version":"","slice_uuid":"8f528c10-3e80-3dd6-b0be-5d558f64f7ab","build_version":"","platform":1,"share_with_app_devs":1,"is_first_party":1,"etl_key":"3","bug_type":"309","os_version":"macOS 11.3","incident_id":"FA21DF23-3344-4E45-BF27-4B8E63B7012B","name":"json.test.tmp.out"}
+{
+  "uptime" : 320000,
+  "procLaunch" : "2021-03-08 13:56:51.7232 -0800",
+  "procRole" : "Unspecified",
+  "version" : 2,
+  "exception" : {
+    "type" : "EXC_BAD_ACCESS",
+    "signal" : "SIGSEGV",
+    "subtype" : "KERN_INVALID_ADDRESS at 0x0000000000000000"
+  },
+  "userID" : 501,
+  "modelCode" : "iMacPro1,1",
+  "coalitionID" : 6086,
+  "osVersion" : {
+    "train" : "macOS 11.3",
+    "build" : "",
+    "releaseType" : ""
+  },
+  "captureTime" : "2021-03-08 13:56:51.8610 -0800",
+  "incident" : "FA21DF23-3344-4E45-BF27-4B8E63B7012B",
+  "pid" : 72932,
+  "cpuType" : "X86-64",
+  "procName" : "json.test.tmp.out",
+  "procPath" : "\/Users\/USER\/*\/json.test.tmp.out",
+  "parentProc" : "fish",
+  "parentPid" : 67002,
+  "coalitionName" : "io.alacritty",
+  "crashReporterKey" : "DCEF35CB-68D5-F524-FF13-060901F52EA8",
+  "responsiblePid" : 65465,
+  "responsibleProc" : "alacritty",
+  "bridgeVersion" : {"build":"18P4544","train":"5.3"},
+  "sip" : "enabled",
+  "isCorpse" : 1,
+  "termination" : {"flags":0,"code":11,"namespace":"SIGNAL","indicator":"Segmentation fault: 11","byProc":"exc handler","byPid":72932},
+  "asi" : {"dyld":["dyld2 mode"]},
+  "extMods" : {"caller":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"system":{"thread_create":0,"thread_set_state":125361,"task_for_pid":9935},"targeted":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"warnings":0},
+  "faultingThread" : 0,
+  "threads" : [
+  {
+    "triggered": true,
+    "id": 6152004,
+    "name": "Crashing Thread Name",
+    "queue": "com.apple.main-thread",
+    "frames": [
+      {
+        "imageOffset": @foo@,
+        "sourceLine": 3,
+        "sourceFile": "test.c",
+        "symbol": "foo",
+        "imageIndex": 0,
+        "symbolLocation": 16
+      },
+      {
+        "imageOffset": @bar@,
+        "sourceLine": 6,
+        "sourceFile": "test.c",
+        "symbol": "bar",
+        "imageIndex": 0,
+        "symbolLocation": 9
+      },
+      {
+        "imageOffset": @main@,
+        "sourceLine": 8,
+        "sourceFile": "test.c",
+        "symbol": "main",
+        "imageIndex": 0,
+        "symbolLocation": 20
+      },
+      {
+        "imageOffset": 89917,
+        "symbol": "start",
+        "symbolLocation": 1,
+        "imageIndex": 1
+      }
+    ]
+  }
+],
+  "usedImages" : [
+  {
+    "source" : "P",
+    "arch" : "x86_64",
+    "base" : 4355608576,
+    "size" : 16384,
+    "uuid" : "@UUID@",
+    "path" : "@EXEC@",
+    "name" : "@NAME@"
+  },
+  {
+    "source" : "P",
+    "arch" : "x86_64",
+    "base" : 140733734899712,
+    "size" : 245760,
+    "uuid" : "c5caf30b-0617-3b07-88c7-6319cd06f30a",
+    "path" : "\/usr\/lib\/system\/libdyld.dylib",
+    "name" : "libdyld.dylib"
+  }
+],
+  "legacyInfo" : {
+  "threadTriggered" : {
+    "queue" : "com.apple.main-thread"
+  }
+}
+}
diff --git a/lldb/test/Shell/ScriptInterpreter/Python/Crashlog/no_threadState.test b/lldb/test/Shell/ScriptInterpreter/Python/Crashlog/no_threadState.test
new file mode 100644
--- /dev/null
+++ b/lldb/test/Shell/ScriptInterpreter/Python/Crashlog/no_threadState.test
@@ -0,0 +1,11 @@
+# RUN: %clang_host -g %S/Inputs/test.c -o %t.out
+
+# RUN: cp %S/Inputs/no_threadState.ips %t.crash
+# RUN: python %S/patch-crashlog.py --binary %t.out --crashlog %t.crash --offsets '{"main":20, "bar":9, "foo":16}' --json
+# RUN: %lldb %t.out -o 'command script import lldb.macosx.crashlog' -o 'crashlog %t.crash' 2>&1 | FileCheck %s
+
+# CHECK: Thread[0] Crashing Thread Name EXC_BAD_ACCESS (SIGSEGV) (KERN_INVALID_ADDRESS at 0x0000000000000000)
+# CHECK: [  0] {{.*}}out`foo + 16 at test.c
+# CHECK: [  1] {{.*}}out`bar + 8 at test.c
+# CHECK: [  2] {{.*}}out`main + 19 at test.c
+# CHECK: No thread state (register information) available