diff --git a/7.3.950 b/7.3.950
new file mode 100644
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--- /dev/null
+++ b/7.3.950
@@ -0,0 +1,185 @@
+To: vim_dev@googlegroups.com
+Subject: Patch 7.3.950
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.3.950
+Problem: Python: Stack trace printer can't handle messages.
+Solution: Make KeyErrors use PyErr_SetObject. (ZyX)
+Files: src/if_py_both.h, src/if_python3.c, src/if_python.c
+
+
+*** ../vim-7.3.949/src/if_py_both.h 2013-05-15 15:12:25.000000000 +0200
+--- src/if_py_both.h 2013-05-15 15:16:23.000000000 +0200
+***************
+*** 734,740 ****
+
+ if (di == NULL)
+ {
+! PyErr_SetString(PyExc_KeyError, _("no such key in dictionary"));
+ return NULL;
+ }
+
+--- 734,740 ----
+
+ if (di == NULL)
+ {
+! PyErr_SetObject(PyExc_KeyError, keyObject);
+ return NULL;
+ }
+
+***************
+*** 767,773 ****
+ if (di == NULL)
+ {
+ DICTKEY_UNREF
+! PyErr_SetString(PyExc_IndexError, _("no such key in dictionary"));
+ return -1;
+ }
+ hi = hash_find(&d->dv_hashtab, di->di_key);
+--- 767,773 ----
+ if (di == NULL)
+ {
+ DICTKEY_UNREF
+! PyErr_SetObject(PyExc_KeyError, keyObject);
+ return -1;
+ }
+ hi = hash_find(&d->dv_hashtab, di->di_key);
+***************
+*** 1353,1359 ****
+
+ if (flags == 0)
+ {
+! PyErr_SetString(PyExc_KeyError, "Option does not exist in given scope");
+ return NULL;
+ }
+
+--- 1353,1359 ----
+
+ if (flags == 0)
+ {
+! PyErr_SetObject(PyExc_KeyError, keyObject);
+ return NULL;
+ }
+
+***************
+*** 1447,1453 ****
+
+ if (flags == 0)
+ {
+! PyErr_SetString(PyExc_KeyError, "Option does not exist in given scope");
+ return -1;
+ }
+
+--- 1447,1453 ----
+
+ if (flags == 0)
+ {
+! PyErr_SetObject(PyExc_KeyError, keyObject);
+ return -1;
+ }
+
+***************
+*** 3145,3151 ****
+ return BufferNew(b);
+ else
+ {
+! PyErr_SetString(PyExc_KeyError, _("no such buffer"));
+ return NULL;
+ }
+ }
+--- 3145,3151 ----
+ return BufferNew(b);
+ else
+ {
+! PyErr_SetObject(PyExc_KeyError, keyObject);
+ return NULL;
+ }
+ }
+*** ../vim-7.3.949/src/if_python3.c 2013-05-15 15:12:25.000000000 +0200
+--- src/if_python3.c 2013-05-15 15:16:23.000000000 +0200
+***************
+*** 128,133 ****
+--- 128,134 ----
+ # define PyErr_Occurred py3_PyErr_Occurred
+ # define PyErr_SetNone py3_PyErr_SetNone
+ # define PyErr_SetString py3_PyErr_SetString
++ # define PyErr_SetObject py3_PyErr_SetObject
+ # define PyEval_InitThreads py3_PyEval_InitThreads
+ # define PyEval_RestoreThread py3_PyEval_RestoreThread
+ # define PyEval_SaveThread py3_PyEval_SaveThread
+***************
+*** 250,255 ****
+--- 251,257 ----
+ static PyObject* (*py3_PyErr_NoMemory)(void);
+ static void (*py3_Py_Finalize)(void);
+ static void (*py3_PyErr_SetString)(PyObject *, const char *);
++ static void (*py3_PyErr_SetObject)(PyObject *, PyObject *);
+ static int (*py3_PyRun_SimpleString)(char *);
+ static PyObject* (*py3_PyRun_String)(char *, int, PyObject *, PyObject *);
+ static PyObject* (*py3_PyList_GetItem)(PyObject *, Py_ssize_t);
+***************
+*** 379,384 ****
+--- 381,387 ----
+ {"PyErr_NoMemory", (PYTHON_PROC*)&py3_PyErr_NoMemory},
+ {"Py_Finalize", (PYTHON_PROC*)&py3_Py_Finalize},
+ {"PyErr_SetString", (PYTHON_PROC*)&py3_PyErr_SetString},
++ {"PyErr_SetObject", (PYTHON_PROC*)&py3_PyErr_SetObject},
+ {"PyRun_SimpleString", (PYTHON_PROC*)&py3_PyRun_SimpleString},
+ {"PyRun_String", (PYTHON_PROC*)&py3_PyRun_String},
+ {"PyList_GetItem", (PYTHON_PROC*)&py3_PyList_GetItem},
+*** ../vim-7.3.949/src/if_python.c 2013-05-15 15:12:25.000000000 +0200
+--- src/if_python.c 2013-05-15 15:16:23.000000000 +0200
+***************
+*** 155,160 ****
+--- 155,161 ----
+ # define PyErr_Occurred dll_PyErr_Occurred
+ # define PyErr_SetNone dll_PyErr_SetNone
+ # define PyErr_SetString dll_PyErr_SetString
++ # define PyErr_SetObject dll_PyErr_SetObject
+ # define PyEval_InitThreads dll_PyEval_InitThreads
+ # define PyEval_RestoreThread dll_PyEval_RestoreThread
+ # define PyEval_SaveThread dll_PyEval_SaveThread
+***************
+*** 260,265 ****
+--- 261,267 ----
+ static PyObject*(*dll_PyErr_Occurred)(void);
+ static void(*dll_PyErr_SetNone)(PyObject *);
+ static void(*dll_PyErr_SetString)(PyObject *, const char *);
++ static void(*dll_PyErr_SetObject)(PyObject *, PyObject *);
+ static void(*dll_PyEval_InitThreads)(void);
+ static void(*dll_PyEval_RestoreThread)(PyThreadState *);
+ static PyThreadState*(*dll_PyEval_SaveThread)(void);
+***************
+*** 393,398 ****
+--- 395,401 ----
+ {"PyErr_Occurred", (PYTHON_PROC*)&dll_PyErr_Occurred},
+ {"PyErr_SetNone", (PYTHON_PROC*)&dll_PyErr_SetNone},
+ {"PyErr_SetString", (PYTHON_PROC*)&dll_PyErr_SetString},
++ {"PyErr_SetObject", (PYTHON_PROC*)&dll_PyErr_SetObject},
+ {"PyEval_InitThreads", (PYTHON_PROC*)&dll_PyEval_InitThreads},
+ {"PyEval_RestoreThread", (PYTHON_PROC*)&dll_PyEval_RestoreThread},
+ {"PyEval_SaveThread", (PYTHON_PROC*)&dll_PyEval_SaveThread},
+*** ../vim-7.3.949/src/version.c 2013-05-15 15:12:25.000000000 +0200
+--- src/version.c 2013-05-15 15:17:56.000000000 +0200
+***************
+*** 730,731 ****
+--- 730,733 ----
+ { /* Add new patch number below this line */
++ /**/
++ 950,
+ /**/
+
+--
+-rwxr-xr-x 1 root 24 Oct 29 1929 /bin/ed
+-rwxr-xr-t 4 root 131720 Jan 1 1970 /usr/ucb/vi
+-rwxr-xr-x 1 root 5.89824e37 Oct 22 1990 /usr/bin/emacs
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net \\\
+/// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\ an exciting new programming language -- http://www.Zimbu.org ///
+ \\\ help me help AIDS victims -- http://ICCF-Holland.org ///