diff --git a/SOURCES/ltrace-0.7.91-null.patch b/SOURCES/ltrace-0.7.91-null.patch
new file mode 100644
index 0000000..4ff7e6a
--- /dev/null
+++ b/SOURCES/ltrace-0.7.91-null.patch
@@ -0,0 +1,14 @@
+diff --git a/output.c b/output.c
+index 7cab383..18f9cf0 100644
+--- a/output.c
++++ b/output.c
+@@ -598,6 +598,9 @@ frame_callback (Dwfl_Frame *state, void *arg)
+ 					   NULL, NULL, NULL);
+ 		symname = dwfl_module_addrinfo(mod, pc, &off, &sym,
+ 					       NULL, NULL, NULL);
++	} else {
++		modname = "unknown";
++		symname = "unknown";
+ 	}
+ 
+ 	/* This mimics the output produced by libunwind below.  */
diff --git a/SPECS/ltrace.spec b/SPECS/ltrace.spec
index cc812b0..3bc0bd7 100644
--- a/SPECS/ltrace.spec
+++ b/SPECS/ltrace.spec
@@ -3,7 +3,7 @@
 Summary: Tracks runtime library calls from dynamically linked executables
 Name: %{?scl_prefix}ltrace
 Version: 0.7.91
-Release: 1%{?dist}
+Release: 2%{?dist}
 URL: http://ltrace.alioth.debian.org/
 License: GPLv2+
 Group: Development/Debuggers
@@ -103,6 +103,9 @@ Patch25: ltrace-rh1307754.patch
 # GCC now warns (errors) on "tautological compares", and readdir_r is deprecated.
 Patch26: ltrace-0.7.91-tautology.patch
 
+# gcc-9 fix.  Avoid passing NULL as argument to %s
+Patch27: ltrace-0.7.91-null.patch
+
 # https://bugzilla.redhat.com/show_bug.cgi?id=1196697
 Patch200: ltrace-0.7.91-XDG_CONFIG_DIRS.patch
 Patch201: ltrace-0.7.91-XDG_CONFIG_DIRS-2.patch
@@ -157,6 +160,7 @@ execution of processes.
 %patch24 -p1
 %patch25 -p1
 %patch26 -p1
+%patch27 -p1
 %patch200 -p1
 %patch201 -p1
 %patch202 -p1
@@ -189,6 +193,9 @@ echo ====================TESTING END=====================
 %{_datadir}/ltrace
 
 %changelog
+* Wed Jan  8 2020 Jeff Law <law@redhat.com> - 0.7.91-2
+- Avoid passing NULL as argument to %s in printf call
+
 * Mon Aug 5 2019 DJ Delorie <dj@redhat.com> - 0.7.91-1
 - Reset to -1 for devtoolset-9 (#1736671)