diff --git a/src/reports/data/sonata_data.cpp b/src/reports/data/sonata_data.cpp
index b43d634..57cb647 100644
--- a/src/reports/data/sonata_data.cpp
+++ b/src/reports/data/sonata_data.cpp
@@ -23,7 +23,7 @@ SonataData::SonataData(const std::string& report_name,
     , hdf5_writer_(std::make_unique<HDF5Writer>(report_name))
     , nodes_(nodes) {
     prepare_buffer(max_buffer_size);
-    index_pointers_.resize(nodes->size() + 1);
+    index_pointers_.resize(nodes->size());
     time_ = {tstart, tend, dt};
 
     reporting_period_ = static_cast<int>(dt / SonataReport::atomic_step_);
@@ -207,6 +207,11 @@ void SonataData::prepare_dataset() {
                   total_elements_,
                   element_offset);
 
+    int last_rank = Implementation::get_last_rank(report_name_, SonataReport::rank_);
+    if(SonataReport::rank_ == last_rank) {
+        index_pointers_.resize(nodes_->size() + 1);
+    }
+
     // Prepare index pointers
     if (!index_pointers_.empty()) {
         index_pointers_[0] = element_offset;
diff --git a/src/reports/library/implementation_interface.hpp b/src/reports/library/implementation_interface.hpp
index 53bdf8c..9ca5f21 100644
--- a/src/reports/library/implementation_interface.hpp
+++ b/src/reports/library/implementation_interface.hpp
@@ -33,6 +33,9 @@ struct Implementation {
     static hsize_t get_offset(const std::string& report_name, hsize_t value) {
         return TImpl::get_offset(report_name, value);
     }
+    static int get_last_rank(const std::string& report_name, int value) {
+        return TImpl::get_last_rank(report_name, value);
+    }
     static hsize_t get_global_dims(const std::string& report_name, hsize_t value) {
         return TImpl::get_global_dims(report_name, value);
     }
@@ -186,6 +189,12 @@ struct ParallelImplementation {
         return offset;
     };
 
+    static int get_last_rank(const std::string& report_name, int value) {
+        int last_rank = 0;
+        MPI_Allreduce(&value, &last_rank, 1, MPI_INT, MPI_MAX, get_Comm(report_name));
+        return last_rank;
+    }
+
     static hsize_t get_global_dims(const std::string& report_name, hsize_t value) {
         hsize_t global_dims = value;
         MPI_Allreduce(&value, &global_dims, 1, MPI_UNSIGNED_LONG, MPI_SUM, get_Comm(report_name));
@@ -293,6 +302,9 @@ struct SerialImplementation {
     static hsize_t get_offset(const std::string& /*report_name*/, hsize_t /*value*/) {
         return 0;
     };
+    static int get_last_rank(const std::string& /*report_name*/, hsize_t /*value*/) {
+        return 0;
+    };
     static hsize_t get_global_dims(const std::string& /*report_name*/, hsize_t value) {
         return value;
     };