diff --git a/sane-backends.spec b/sane-backends.spec
index 27a0aa1..7808ce7 100644
--- a/sane-backends.spec
+++ b/sane-backends.spec
@@ -458,6 +458,7 @@ exit 0
 - 1761145, 1761001, 1761051, 1761234 - genesys backend now needs gcc-c++, it is not built otherwise
 - 1758886 - CanoScan LiDE scanners supported by genesys backend are not detected
 - 1760916 - Samsung C460 does not have JPEG support
+- 1761530 - genesys aborts when accessing invalid vector index and built with GLIBCXX_ASSERTIONS
 
 * Mon Sep 30 2019 Zdenek Dohnal <zdohnal@redhat.com> - 1.0.28-1
 - 1.0.28
diff --git a/sane-genesys-vector-glibcxxassert.patch b/sane-genesys-vector-glibcxxassert.patch
new file mode 100644
index 0000000..48ed253
--- /dev/null
+++ b/sane-genesys-vector-glibcxxassert.patch
@@ -0,0 +1,56 @@
+diff --git a/backend/genesys_low.cc b/backend/genesys_low.cc
+index 097375f..20dd3a4 100644
+--- a/backend/genesys_low.cc
++++ b/backend/genesys_low.cc
+@@ -49,6 +49,11 @@
+ 
+ #include <vector>
+ 
++template <typename T>
++T safe_vec_addr(std::vector<T>& vec, int i)
++{
++  return vec.size() >= (unsigned long int)(i+1) ? vec[i] : (T)0;
++}
+ 
+ Genesys_Device::~Genesys_Device()
+ {
+@@ -1209,17 +1214,17 @@ SANE_Status sanei_genesys_generate_gamma_buffer(Genesys_Device * dev,
+                              dev->settings.brightness);
+       for (int i = 0; i < size; i++)
+         {
+-          uint16_t value=rgamma[i];
++          uint16_t value = safe_vec_addr(rgamma, i);
+           value=lut[value];
+           gamma[i * 2 + size * 0 + 0] = value & 0xff;
+           gamma[i * 2 + size * 0 + 1] = (value >> 8) & 0xff;
+ 
+-          value=ggamma[i];
++          value = safe_vec_addr(ggamma, i);
+           value=lut[value];
+           gamma[i * 2 + size * 2 + 0] = value & 0xff;
+           gamma[i * 2 + size * 2 + 1] = (value >> 8) & 0xff;
+ 
+-          value=bgamma[i];
++          value = safe_vec_addr(bgamma, i);
+           value=lut[value];
+           gamma[i * 2 + size * 4 + 0] = value & 0xff;
+           gamma[i * 2 + size * 4 + 1] = (value >> 8) & 0xff;
+@@ -1229,15 +1234,15 @@ SANE_Status sanei_genesys_generate_gamma_buffer(Genesys_Device * dev,
+     {
+       for (int i = 0; i < size; i++)
+         {
+-          uint16_t value=rgamma[i];
++          uint16_t value = safe_vec_addr(rgamma, i);
+           gamma[i * 2 + size * 0 + 0] = value & 0xff;
+           gamma[i * 2 + size * 0 + 1] = (value >> 8) & 0xff;
+ 
+-          value=ggamma[i];
++          value = safe_vec_addr(ggamma, i);
+           gamma[i * 2 + size * 2 + 0] = value & 0xff;
+           gamma[i * 2 + size * 2 + 1] = (value >> 8) & 0xff;
+ 
+-          value=bgamma[i];
++          value = safe_vec_addr(bgamma, i);
+           gamma[i * 2 + size * 4 + 0] = value & 0xff;
+           gamma[i * 2 + size * 4 + 1] = (value >> 8) & 0xff;
+         }