diff --git a/src/hotspot/share/adlc/output_h.cpp b/src/hotspot/share/adlc/output_h.cpp
index cbcc00efa3b9c..38a74ca15fda9 100644
--- a/src/hotspot/share/adlc/output_h.cpp
+++ b/src/hotspot/share/adlc/output_h.cpp
@@ -1949,6 +1949,7 @@ void ArchDesc::declareClasses(FILE *fp) {
       fprintf(fp, " };\n");
     }*/
     else if( instr->is_ideal_copy() &&
+            (instr->_matrule != nullptr && instr->_matrule->_rChild != nullptr) &&
               !strcmp(instr->_matrule->_lChild->_opType,"stackSlotP") ) {
       // !!!!!
       // Special hack for ideal Copy of pointer.  Bottom type is oop or not depending on input.
diff --git a/src/hotspot/share/c1/c1_LinearScan.cpp b/src/hotspot/share/c1/c1_LinearScan.cpp
index b00ab25b8f0b9..038323342f05f 100644
--- a/src/hotspot/share/c1/c1_LinearScan.cpp
+++ b/src/hotspot/share/c1/c1_LinearScan.cpp
@@ -4418,7 +4418,8 @@ Interval* Interval::split(int split_pos) {
   }
   assert(cur != Range::end(), "split interval after end of last range");
 
-  if (cur->from() < split_pos) {
+  if ((cur != nullptr) &&
+      (cur->from() < split_pos)) {
     result->_first = new Range(split_pos, cur->to(), cur->next());
     cur->set_to(split_pos);
     cur->set_next(Range::end());
diff --git a/src/hotspot/share/jfr/periodic/sampling/jfrThreadSampler.cpp b/src/hotspot/share/jfr/periodic/sampling/jfrThreadSampler.cpp
index 4c44c43772d0a..36f3eb037f96b 100644
--- a/src/hotspot/share/jfr/periodic/sampling/jfrThreadSampler.cpp
+++ b/src/hotspot/share/jfr/periodic/sampling/jfrThreadSampler.cpp
@@ -470,7 +470,7 @@ void JfrThreadSampler::set_period(bool is_java_period, int64_t period_millis) {
 
 void JfrThreadSampler::set_java_sample_period(int64_t period_millis) {
   assert(period_millis >= 0, "invariant");
-  if (_instance == nullptr && 0 == period_millis) {
+  if (_instance == nullptr || 0 == period_millis) {
     return;
   }
   instance().set_period(true, period_millis);
@@ -478,7 +478,7 @@ void JfrThreadSampler::set_java_sample_period(int64_t period_millis) {
 
 void JfrThreadSampler::set_native_sample_period(int64_t period_millis) {
   assert(period_millis >= 0, "invariant");
-  if (_instance == nullptr && 0 == period_millis) {
+  if (_instance == nullptr || 0 == period_millis) {
     return;
   }
   instance().set_period(false, period_millis);
diff --git a/src/hotspot/share/jvmci/jvmciEnv.cpp b/src/hotspot/share/jvmci/jvmciEnv.cpp
index 23473940178c6..3c1c1daaf6bb6 100644
--- a/src/hotspot/share/jvmci/jvmciEnv.cpp
+++ b/src/hotspot/share/jvmci/jvmciEnv.cpp
@@ -61,6 +61,7 @@ JVMCICompileState::JVMCICompileState(CompileTask* task, JVMCICompiler* compiler)
   _jvmti_can_access_local_variables     = JvmtiExport::can_access_local_variables() ? 1 : 0;
   _jvmti_can_post_on_exceptions         = JvmtiExport::can_post_on_exceptions() ? 1 : 0;
   _jvmti_can_pop_frame                  = JvmtiExport::can_pop_frame() ? 1 : 0;
+  assert(_task != nullptr, "The task cannot be null");
   _target_method_is_old                 = _task != nullptr && _task->method()->is_old();
   if (task->is_blocking()) {
     task->set_blocking_jvmci_compile_state(this);
diff --git a/src/hotspot/share/nmt/mallocSiteTable.cpp b/src/hotspot/share/nmt/mallocSiteTable.cpp
index 55fa5f0b173ed..800791949af28 100644
--- a/src/hotspot/share/nmt/mallocSiteTable.cpp
+++ b/src/hotspot/share/nmt/mallocSiteTable.cpp
@@ -168,8 +168,9 @@ MallocSite* MallocSiteTable::malloc_site(uint32_t marker) {
   MallocSiteHashtableEntry* head = _table[bucket_idx];
   for (size_t index = 0;
        index < pos_idx && head != nullptr;
-       index++, head = (MallocSiteHashtableEntry*)head->next()) {}
-  assert(head != nullptr, "Invalid position index");
+       index++, head = ((MallocSiteHashtableEntry*)head->next() == nullptr) ? head :
+      (MallocSiteHashtableEntry*)head->next()) {}
+
   return head->data();
 }
 
diff --git a/src/hotspot/share/opto/vectorIntrinsics.cpp b/src/hotspot/share/opto/vectorIntrinsics.cpp
index 10430a09e7231..6443a3355d6a7 100644
--- a/src/hotspot/share/opto/vectorIntrinsics.cpp
+++ b/src/hotspot/share/opto/vectorIntrinsics.cpp
@@ -1313,7 +1313,7 @@ bool LibraryCallKit::inline_vector_gather_scatter(bool is_scatter) {
   const TypeAryPtr* arr_type = addr_type->isa_aryptr();
 
   // The array must be consistent with vector type
-  if (arr_type == nullptr || (arr_type != nullptr && !elem_consistent_with_arr(elem_bt, arr_type, false))) {
+  if (arr_type != nullptr && !elem_consistent_with_arr(elem_bt, arr_type, false)) {
     log_if_needed("  ** not supported: arity=%d op=%s vlen=%d etype=%s atype=%s ismask=no",
                     is_scatter, is_scatter ? "scatter" : "gather",
                     num_elem, type2name(elem_bt), type2name(arr_type->elem()->array_element_basic_type()));
diff --git a/src/hotspot/share/runtime/continuationFreezeThaw.cpp b/src/hotspot/share/runtime/continuationFreezeThaw.cpp
index a928b0443eef4..a93b6c8a8b5d5 100644
--- a/src/hotspot/share/runtime/continuationFreezeThaw.cpp
+++ b/src/hotspot/share/runtime/continuationFreezeThaw.cpp
@@ -1047,7 +1047,8 @@ freeze_result FreezeBase::finalize_freeze(const frame& callee, frame& caller, in
   assert(!allocated_old_in_freeze_fast || (!UseZGC && !UseG1GC), "Unexpected allocation");
 
   DEBUG_ONLY(bool empty_chunk = true);
-  if (unextended_sp < _freeze_size || chunk->is_gc_mode() || (!allocated_old_in_freeze_fast && chunk->requires_barriers())) {
+  if (unextended_sp < _freeze_size || (chunk != nullptr &&
+      (chunk->is_gc_mode() || (!allocated_old_in_freeze_fast && chunk->requires_barriers())))) {
     // ALLOCATE NEW CHUNK
 
     if (lt.develop_is_enabled()) {