diff --git a/onert-micro/onert-micro/include/core/OMDataType.h b/onert-micro/onert-micro/include/core/OMDataType.h
index d60fa162a9e..a6f5e06bc73 100644
--- a/onert-micro/onert-micro/include/core/OMDataType.h
+++ b/onert-micro/onert-micro/include/core/OMDataType.h
@@ -172,7 +172,7 @@ inline uint32_t size(OMDataType data_type)
     default:
       // TODO Support remaining data types.
       assert(false);
-      return UINT32_MAX; // Avoid compiler warning.
+      return 1; // Avoid compiler warning.
   }
 }
 
diff --git a/onert-micro/onert-micro/include/execute/OMRuntimeKernel.h b/onert-micro/onert-micro/include/execute/OMRuntimeKernel.h
index fcedcb4ec4c..b6f63cdaa48 100644
--- a/onert-micro/onert-micro/include/execute/OMRuntimeKernel.h
+++ b/onert-micro/onert-micro/include/execute/OMRuntimeKernel.h
@@ -57,8 +57,8 @@ class OMRuntimeKernel
   int32_t inputs_index[maxInputSize] = {-1};
   int32_t outputs_index[maxOutputSize] = {-1};
 
-  uint32_t outputs_num = -1;
-  uint32_t inputs_num = -1;
+  uint32_t outputs_num = 0;
+  uint32_t inputs_num = 0;
 
   const circle::Operator *first_operator = nullptr;
 };
diff --git a/onert-micro/onert-micro/include/pal/common/PALSpaceToDepthCommon.h b/onert-micro/onert-micro/include/pal/common/PALSpaceToDepthCommon.h
index 28f31e5a031..c3e7d4def15 100644
--- a/onert-micro/onert-micro/include/pal/common/PALSpaceToDepthCommon.h
+++ b/onert-micro/onert-micro/include/pal/common/PALSpaceToDepthCommon.h
@@ -34,6 +34,11 @@ inline OMStatus SpaceToDepth(const int32_t block_size,
                              const T *input_data,
                              const core::OMRuntimeShape &unextended_output_shape, T *output_data)
 {
+  if (block_size == 0)
+  {
+    return FailedCheckCondition;
+  }
+
   const core::OMRuntimeShape input_shape =
     core::OMRuntimeShape::extendedShape(4, unextended_input_shape);
   const core::OMRuntimeShape output_shape =
diff --git a/onert-micro/onert-micro/src/api/onert-micro.cpp b/onert-micro/onert-micro/src/api/onert-micro.cpp
index fabaeae7b37..908ba21fac2 100644
--- a/onert-micro/onert-micro/src/api/onert-micro.cpp
+++ b/onert-micro/onert-micro/src/api/onert-micro.cpp
@@ -194,6 +194,7 @@ NNFW_STATUS nnfw_session::loadOptimizerInfo(const circle::ModelTraining *circle_
 NNFW_STATUS nnfw_session::loadLossInfo(const circle::ModelTraining *circle_model)
 {
   assert(circle_model != nullptr);
+  NNFW_RETURN_ERROR_IF_NULL(circle_model);
 
   const circle::LossFn circle_loss = circle_model->lossfn();
 
@@ -219,6 +220,7 @@ NNFW_STATUS nnfw_session::loadLossInfo(const circle::ModelTraining *circle_model
 NNFW_STATUS nnfw_session::loadTrainableOps(const circle::ModelTraining *circle_model, int num_ops)
 {
   assert(circle_model != nullptr);
+  NNFW_RETURN_ERROR_IF_NULL(circle_model);
 
   auto ops_list = circle_model->trainable_ops();
   if (ops_list != nullptr)
@@ -245,12 +247,22 @@ NNFW_STATUS nnfw_session::loadTrainingInfo(char *buf)
         continue;
       data = (model->buffers()->Get(metadata->buffer()))->data()->data();
     }
+    NNFW_RETURN_ERROR_IF_NULL(data);
+
     const circle::ModelTraining *traininfo_model =
       circle::GetModelTraining(static_cast<const void *>(data));
     _config.training_context.batch_size = traininfo_model->batch_size();
-    loadOptimizerInfo(traininfo_model);
-    loadLossInfo(traininfo_model);
-    loadTrainableOps(traininfo_model, num_ops);
+    NNFW_STATUS status = loadOptimizerInfo(traininfo_model);
+    if (status != NNFW_STATUS_NO_ERROR)
+      return status;
+
+    status = loadLossInfo(traininfo_model);
+    if (status != NNFW_STATUS_NO_ERROR)
+      return status;
+
+    status = loadTrainableOps(traininfo_model, num_ops);
+    if (status != NNFW_STATUS_NO_ERROR)
+      return status;
   }
   return NNFW_STATUS_NO_ERROR;
 }
diff --git a/onert-micro/onert-micro/src/execute/kernels/FloorDiv.cpp b/onert-micro/onert-micro/src/execute/kernels/FloorDiv.cpp
index ca70d729ae2..ccff542e23e 100644
--- a/onert-micro/onert-micro/src/execute/kernels/FloorDiv.cpp
+++ b/onert-micro/onert-micro/src/execute/kernels/FloorDiv.cpp
@@ -50,7 +50,9 @@ OMStatus onert_micro::execute::execute_kernel_CircleFloorDiv(const OMExecuteArgs
       // Check the denominator
       for (int i = 0; i < input_shape2.flatSize(); ++i)
       {
-        utils::checkCondition(core::utils::castInputData<float>(input_data2)[i] != 0);
+        status = utils::checkCondition(core::utils::castInputData<float>(input_data2)[i] != 0);
+        if (status != Ok)
+          return status;
       }
       // check that input and output dimensions are equal
       if (input_shape1 == input_shape2)
diff --git a/onert-micro/onert-micro/src/optimize/pass/FindInplaceOpPass.cpp b/onert-micro/onert-micro/src/optimize/pass/FindInplaceOpPass.cpp
index 9239320fba9..08d2ee7dcae 100644
--- a/onert-micro/onert-micro/src/optimize/pass/FindInplaceOpPass.cpp
+++ b/onert-micro/onert-micro/src/optimize/pass/FindInplaceOpPass.cpp
@@ -199,7 +199,7 @@ OMStatus checkInplaceOp(core::OMRuntimeContext &context, const circle::Operator
 OMStatus findInplaceOp(core::OMRuntimeStorage &storage, core::OMRuntimeContext &context,
                        const OMConfig &configs, bool &is_changed)
 {
-  OMStatus status;
+  OMStatus status = Ok;
 
   const core::reader::CircleOperators *operators = context.getCircleOperators();