diff --git a/genesys-slope-assert.patch b/genesys-slope-assert.patch
new file mode 100644
index 0000000..7e24b48
--- /dev/null
+++ b/genesys-slope-assert.patch
@@ -0,0 +1,13 @@
+diff --git a/backend/genesys/gl841.cpp b/backend/genesys/gl841.cpp
+index 470f9ba..c11a434 100644
+--- a/backend/genesys/gl841.cpp
++++ b/backend/genesys/gl841.cpp
+@@ -944,7 +944,7 @@ HOME_FREE: 3
+         r->value |= REG_0x02_MTRREV;
+     }
+ 
+-    gl841_send_slope_table(dev, 3, fast_table.table, 256);
++    gl841_send_slope_table(dev, 3, fast_table.table, 255);
+ 
+     r = sanei_genesys_get_address(reg, 0x67);
+     r->value = 0x3f;
diff --git a/sane-backends.spec b/sane-backends.spec
index 7f760ae..82936c9 100644
--- a/sane-backends.spec
+++ b/sane-backends.spec
@@ -14,7 +14,7 @@
 Summary: Scanner access software
 Name: sane-backends
 Version: 1.0.29
-Release: 4%{?dist}
+Release: 5%{?dist}
 # lib/ is LGPLv2+, backends are GPLv2+ with exceptions
 # Tools are GPLv2+, docs are public domain
 # see LICENSE for details
@@ -39,6 +39,7 @@ Patch3: sane-backends-saned-manpage.patch
 # undeclared variable on s390x, from upstream
 # https://gitlab.com/sane-project/backends/-/merge_requests/329
 Patch4: sane-genesys-s390x-ftbfs.patch
+Patch5: genesys-slope-assert.patch
 
 URL: http://www.sane-project.org
 
@@ -155,6 +156,7 @@ access image acquisition devices available on the local host.
 %patch2 -p1 -b .sane-config-multilib
 %patch3 -p1 -b .saned-manpage
 %patch4 -p1 -b .genesys-s390x-ftbfs
+%patch5 -p1 -b .genesys-slope-assert
 
 %build
 CFLAGS="%optflags -fno-strict-aliasing"
@@ -422,6 +424,9 @@ exit 0
 %{_unitdir}/saned@.service
 
 %changelog
+* Mon Mar 23 2020 Zdenek Dohnal <zdohnal@redhat.com> - 1.0.29-5
+- 1807751 - [abrt] sane-backends: std::__replacement_assert(): scanimage killed by SIGABRT
+
 * Mon Feb 10 2020 Zdenek Dohnal <zdohnal@redhat.com> - 1.0.29-4
 - really fix it...