diff --git a/CHANGELOG.md b/CHANGELOG.md
index 965ff197dcad3abe47a027b8b751426181e193b1..006b7bbdb04105367359169fbcfabb2ef1482969 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,8 @@ KleidiAI follows the [Semantic Versioning](https://semver.org/) specification fo
   - New 4x8 block size variant of matrix multiplication of QAI8DXP LHS and QSI4C32P RHS with F32 output.
     - Optimizations for FEAT_DotProd.
 - Added demonstration of integration using CMake in F16 Arm® Neon™ matrix multiplication example.
+- Fixes:
+  - Fix the RHS packing micro-kernel kai_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon to handle null bias.
 
 ## v1.3.0
 
diff --git a/kai/ukernels/matmul/pack/kai_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon.c b/kai/ukernels/matmul/pack/kai_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon.c
index a594f9d1190f66285fcd2da435655eab3f26de09..d0c66276369fbe141c8bd5c185563c3fb16afe89 100644
--- a/kai/ukernels/matmul/pack/kai_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon.c
+++ b/kai/ukernels/matmul/pack/kai_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon.c
@@ -1,5 +1,5 @@
 //
-// SPDX-FileCopyrightText: Copyright 2024 Arm Limited and/or its affiliates <open-source-office@arm.com>
+// SPDX-FileCopyrightText: Copyright 2024-2025 Arm Limited and/or its affiliates <open-source-office@arm.com>
 //
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -97,18 +97,28 @@ void kai_run_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon(
 
         // Copy the scaling factors and bias
         size_t rows_left = n - row_idx;
+        // Saving scales.
         if (rows_left >= nr) {
             memcpy(scaling_factors, &scale[row_idx], nr * kai_num_bytes_multiplier_rhs);
-            memcpy(biases, &bias[row_idx], nr * kai_num_bytes_bias);
         } else {
             // Fill remaining values
             memcpy(scaling_factors, &scale[row_idx], rows_left * kai_num_bytes_multiplier_rhs);
-            memcpy(biases, &bias[row_idx], rows_left * kai_num_bytes_bias);
             // Set leftover to 0
             memset(&scaling_factors[rows_left], 0, (nr - rows_left) * kai_num_bytes_multiplier_rhs);
-            memset(&biases[rows_left], 0, (nr - rows_left) * kai_num_bytes_bias);
         }
-
+        if (bias == NULL) {
+            // Set bias to 0
+            memset(biases, 0, nr * kai_num_bytes_bias);
+        } else {
+            if (rows_left >= nr) {
+                memcpy(biases, &bias[row_idx], nr * kai_num_bytes_bias);
+            } else {
+                // Fill remaining values
+                memcpy(biases, &bias[row_idx], rows_left * kai_num_bytes_bias);
+                // Set leftover to 0
+                memset(&biases[rows_left], 0, (nr - rows_left) * kai_num_bytes_bias);
+            }
+        }
         // Iterate over rows in the nr row block
         for (size_t nr_block_idx = 0; nr_block_idx < nr; ++nr_block_idx) {
             const uint8_t* const src_row = rhs + ((row_idx + nr_block_idx) * rhs_stride);
diff --git a/kai/ukernels/matmul/pack/kai_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon.h b/kai/ukernels/matmul/pack/kai_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon.h
index 07e953d1f5d8b60373386f319017fc401a3c658d..6e94913af2e3eeffe998e89ef4e696bd9887b9a7 100644
--- a/kai/ukernels/matmul/pack/kai_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon.h
+++ b/kai/ukernels/matmul/pack/kai_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon.h
@@ -1,5 +1,5 @@
 //
-// SPDX-FileCopyrightText: Copyright 2024 Arm Limited and/or its affiliates <open-source-office@arm.com>
+// SPDX-FileCopyrightText: Copyright 2024-2025 Arm Limited and/or its affiliates <open-source-office@arm.com>
 //
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -89,7 +89,7 @@ size_t kai_get_rhs_packed_size_rhs_pack_nxk_qsi4cxps1s0_qsu4cxs1s0_neon(
 /// @param[in]  sr          The number of kr splits. It can be 1 (no splits) up to kr.
 /// @param[in]  rhs         The RHS matrix containing the 4-bit values.
 ///                         Size in bytes is expected to be greater than or equal to n * k * (sizeof(uint8_t) / 2).
-/// @param[in]  bias        The biases.
+/// @param[in]  bias        The biases. The bias is set to 0.f if this argument is NULL.
 /// @param[in]  scale       The scale for each output channel.
 /// @param[out] rhs_packed  The packed RHS matrix.
 /// @param[in]  extra_bytes Extra bytes to append to the end of each row of the packed RHS matrix.