diff --git a/client/crashpad_client_ios.cc b/client/crashpad_client_ios.cc
index 01d34845..467cc0cf 100644
--- a/client/crashpad_client_ios.cc
+++ b/client/crashpad_client_ios.cc
@@ -106,13 +106,22 @@ class CrashHandler : public Thread,
 
   void DumpWithoutCrash(NativeCPUContext* context, bool process_dump) {
     INITIALIZATION_STATE_DCHECK_VALID(initialized_);
-    internal::InProcessHandler::ScopedAlternateWriter scoper(
-        &in_process_handler_);
-    if (scoper.Open()) {
-      DumpWithContext(context);
-      if (process_dump) {
-        in_process_handler_.ProcessIntermediateDump(scoper.path());
+    base::FilePath path;
+    {
+      // Ensure ScopedAlternateWriter's destructor is invoked before processing
+      // the dump, or else any crashes handled during dump processing cannot be
+      // written.
+      internal::InProcessHandler::ScopedAlternateWriter scoper(
+          &in_process_handler_);
+      if (!scoper.Open()) {
+        LOG(ERROR) << "Could not open writer, ignoring dump request.";
+        return;
       }
+      DumpWithContext(context);
+      path = scoper.path();
+    }
+    if (process_dump) {
+      in_process_handler_.ProcessIntermediateDump(path);
     }
   }
 
diff --git a/client/ios_handler/in_process_handler.cc b/client/ios_handler/in_process_handler.cc
index 6058e3b3..ea86f39e 100644
--- a/client/ios_handler/in_process_handler.cc
+++ b/client/ios_handler/in_process_handler.cc
@@ -24,6 +24,7 @@
 #include "minidump/minidump_file_writer.h"
 #include "util/file/directory_reader.h"
 #include "util/file/filesystem.h"
+#include "util/ios/raw_logging.h"
 
 namespace {
 
@@ -116,6 +117,10 @@ void InProcessHandler::DumpExceptionFromSignal(
     siginfo_t* siginfo,
     ucontext_t* context) {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  if (!writer_) {
+    CRASHPAD_RAW_LOG("Cannot DumpExceptionFromSignal without writer_");
+    return;
+  }
   {
     ScopedReport report(writer_.get(), system_data, annotations_);
     InProcessIntermediateDumpHandler::WriteExceptionFromSignal(
@@ -135,6 +140,10 @@ void InProcessHandler::DumpExceptionFromMachException(
     ConstThreadState old_state,
     mach_msg_type_number_t old_state_count) {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  if (!writer_) {
+    CRASHPAD_RAW_LOG("Cannot DumpExceptionFromMachException without writer_");
+    return;
+  }
   {
     ScopedReport report(writer_.get(), system_data, annotations_);
     InProcessIntermediateDumpHandler::WriteExceptionFromMachException(
@@ -155,6 +164,12 @@ void InProcessHandler::DumpExceptionFromNSExceptionFrames(
     const IOSSystemDataCollector& system_data,
     const uint64_t* frames,
     const size_t num_frames) {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  if (!writer_) {
+    CRASHPAD_RAW_LOG(
+        "Cannot DumpExceptionFromNSExceptionFrames without writer_");
+    return;
+  }
   {
     ScopedReport report(
         writer_.get(), system_data, annotations_, frames, num_frames);
@@ -318,6 +333,7 @@ InProcessHandler::ScopedReport::ScopedReport(
       frames_(frames),
       num_frames_(num_frames),
       rootMap_(writer) {
+  DCHECK(writer);
   InProcessIntermediateDumpHandler::WriteHeader(writer);
   InProcessIntermediateDumpHandler::WriteProcessInfo(writer, annotations);
   InProcessIntermediateDumpHandler::WriteSystemInfo(writer, system_data);