fix a couple of issues with last change

Author: tstack

src/grep_proc.cc

@@ -115,19 +115,20 @@ grep_proc<LineType>::start()
 
     require(this->invariant());
 
-    if (this->gp_sink) {
-        // XXX hack to make sure threads used by line_buffer are not active
-        // before the fork.
-        this->gp_sink->grep_quiesce();
-    }
-
     log_info("grep_proc(%p): start with highest %d",
              this,
              (int) this->gp_highest_line);
     if (this->children_active() || this->gp_queue.empty()) {
         log_debug("grep_proc(%p): nothing to do?", this);
         return;
     }
+
+    if (this->gp_sink) {
+        // XXX hack to make sure threads used by line_buffer are not active
+        // before the fork.
+        this->gp_sink->grep_quiesce();
+    }
+
     for (const auto& [index, elem] : lnav::itertools::enumerate(this->gp_queue))
     {
         log_info("  queue[%lu]: [%d:%d)",

src/textview_curses.cc

@@ -1005,10 +1005,12 @@ textview_curses::execute_search(const std::string& regex_orig)
                 top -= REVERSE_SEARCH_OFFSET;
             }
             this->tc_search_op_id = std::move(op_guard).suspend();
-            gp->queue_request(
-                top, gp->until_eof(this->tc_sub_source->text_line_count()));
-            if (top > 0) {
-                gp->queue_request(0_vl, gp->until_line(top));
+            if (this->tc_sub_source != nullptr) {
+                gp->queue_request(
+                    top, gp->until_eof(this->tc_sub_source->text_line_count()));
+                if (top > 0) {
+                    gp->queue_request(0_vl, gp->until_line(top));
+                }
             }
             this->tc_search_start_time = std::chrono::steady_clock::now();
             this->tc_search_duration = std::nullopt;